Rising penetration of new energy vehicles globally fuels surging demand for automotive safety glass, solar car roofs and lithium battery sealing materials. To fill market gaps, Anhui Liwei Chemical completed intelligent production line expansion for optical-grade PVB resin and new-energy-special EVA resin, lifting capacity by 30% to steadily supply auto parts manufacturers in Europe, the Middle East and North America. Optical-grade PVB serves as core raw material for interlayer films of automotive windshields and side windows, featuring light transmittance over 91% and anti-UV aging performance to tackle risks of gravel impact and high-temperature deformation during high-speed driving. Two differentiated EVA grades serve separate scenarios: high-crosslink PV EVA for encapsulation of car roof solar modules, low-melt-index flame-retardant EVA for lithium battery cell sealing and wire harness insulation. A full set of supporting automotive materials is launched simultaneously: low-odor VAE emulsion for nonwoven fabric adhesion of interior trims, formaldehyde-free PVAc emulsion for interior board lamination, and EVOH-EVA blended modified material for anti-corrosion barrier layers of fuel tanks. The five vinyl acetate polymers build a comprehensive automotive material portfolio, enabling clients to source glass, photovoltaic, interior and battery raw materials from one supplier instead of multiple vendors. Liwei’s new energy polymer products have been admitted into supply chains of multiple overseas Tier 1 auto component suppliers, with overseas automotive orders up 52% year-on-year in 2026.

With the full implementation of EU CBAM (Carbon Border Adjustment Mechanism), low-carbon and traceable chemical raw materials have become mandatory thresholds for entering the European market. Recently, Anhui Liwei Chemical announced that five product lines including PVAc, VAE, EVA, EVOH and PVB have all passed ISCC PLUS international sustainable carbon certification, with full REACH registration completed for all grades. Liwei ranks among a small number of domestic manufacturers holding dual certifications for all vinyl acetate polymer categories. The certification covers the whole chain including raw material traceability, production carbon emission control and finished product carbon footprint accounting. The factory upgraded circulating water systems and waste heat recovery equipment, cutting carbon emissions per unit product by 22%. All export shipments can provide ISCC carbon traceability certificates to assist EU clients with carbon tax declaration and avoid extra import carbon costs. Category-specific export advantages are prominent: low-VOC formaldehyde-free PVAc & VAE emulsions comply with EU new environmental regulations for coatings and adhesives; bio-modified EVOH meets EU carbon reduction policies for food packaging; photovoltaic-grade EVA and optical PVB fit low-carbon procurement standards of EU new energy and automotive industries. Leveraging dual certification qualifications, Liwei Chemical launches a distributor recruitment program across Europe, covering core industrial countries such as Germany, France, Spain and Poland, while expanding layout of low-carbon material markets in the Middle East and Australia. EU polymer export orders rose 47% month-on-month in H1 2026, and low-carbon certification acts as the core growth engine for overseas business.

Anhui Liwei Chemical officially launches a full range of PVA (Polyvinyl Alcohol) resin products, covering fully alcoholyzed and partially alcoholyzed mainstream grades in powder and pellet forms. This move completes the upstream and downstream industrial layout of vinyl acetate polymers, realizing full-series supply of PVAc, VAE, EVA, EVOH, PVB and PVA. Known as a versatile fine chemical auxiliary, PVA is a water-soluble, high film-forming and biodegradable polymer. With abundant hydroxyl groups in its molecular structure, it delivers excellent adhesion, dispersion, colloidal protection and weather resistance, featuring non-toxic and eco-friendly properties that meet high-standard production requirements across industries.Liwei’s newly launched PVA products feature stable batch performance, uniform viscosity and low impurity content, accurately adapting to diverse downstream processes. Partially alcoholyzed PVA boasts superior permeability and fluidity, ideal for textile sizing, paper surface sizing and protective colloids for waterborne coatings, effectively improving fabric smoothness, paper strength and coating system stability. Fully alcoholyzed PVA forms dense, high-tensile and water-resistant films, widely applied in high-end water-soluble packaging films, laundry capsule films, agricultural water-retention mulch films, and thickening & strengthening additives for construction dry mortar.Furthermore, PVA serves as the core precursor material for PVB resin synthesis. Leveraging self-produced PVA raw materials, Liwei realizes closed-loop integrated production from PVA to PVB, strictly controlling the transparency, adhesion and impact resistance of PVB interlayer films from the source, and significantly reducing procurement and quality control costs for terminal glass processing enterprises. High-purity cosmetic and medical-grade PVA can be used for skincare moisturizing additives, medical wound dressings and eye drop additives, complying with FDA and EU food contact safety standards and possessing huge potential in global high-end markets.Against the global low-carbon and eco-friendly trend, fully biodegradable PVA serves as an effective alternative to traditional non-degradable plastics, fully complying with global plastic restriction policies. All Liwei PVA products have completed EU REACH registration and can be exported in bulk to Southeast Asia, Europe, America and other regions, providing global clients with cost-effective, one-stop vinyl acetate polymer material solutions.

The difference between vinyl acetate monomer (VAM) and polyvinyl acetate (PVAc) is essentially the difference between a "raw material" and a "finished product." Simply put, VAM is the basic raw material (a small molecule) used to manufacture PVAc, whereas PVAc is a polymer material (a large molecule) formed through the polymerization of VAM. Vinyl Acetate Monomer (VAM) Vinyl acetate monomer is an organic compound with the chemical formula C₄H₆O₂; it belongs to the class of esters. Its molecular structure contains a reactive carbon-carbon double bond, making it a colorless, flammable, volatile liquid with a sweet, pungent odor. Due to the presence of the double bond, the substance is chemically highly reactive and prone to spontaneous polymerization; therefore, polymerization inhibitors (such as hydroquinone) must be added during industrial storage and transport to prevent premature polymerization. Vinyl acetate monomer is not used directly as a finished consumer product but serves as a basic chemical raw material (monomer), primarily used in polymerization reactions to produce polymer materials such as polyvinyl acetate (PVAc), polyvinyl alcohol (PVA), and ethylene-vinyl acetate copolymer (EVA). Polyvinyl Acetate (PVAc) Definition: Polyvinyl acetate is a polymer produced through the polymerization of vinyl acetate monomer (VAM), with the chemical formula (C₄H₆O₂)ₙ, where n represents the number of repeating units. It is a colorless, odorless, and non-toxic solid that is brittle at room temperature and exhibits cold flow properties (meaning it deforms slowly under sustained pressure). Chemically, polyvinyl acetate is stable and inert, showing little tendency to react with other substances. Its most common industrial form is an aqueous emulsion (commonly known as "white glue"), which is widely used in applications such as wood adhesives, paper coatings, architectural paints, and chewing gum bases. Additionally, polyvinyl acetate serves as a key intermediate in the production of polyvinyl alcohol (PVA). Relationship Between the Two Vinyl acetate monomer (VAM) is the raw material used to synthesize polyvinyl acetate (PVAc). Through polymerization, the double bond within the VAM molecule opens, allowing numerous monomer molecules to link together to form long-chain molecules—specifically, PVAc. In brief: VAM is a "monomer" (a small-molecule raw material), while PVAc is a "polymer" (a finished product made of large molecules); the two differ fundamentally in chemical properties and physical form, belonging to different stages of the chemical industry value chain. Vinyl acetate monomer (VAM) → Polymerization → Polyvinyl acetate (PVAc) More than 50% of the PVAc produced globally is used in emulsion form (similar to latex); the most familiar example is the common white glue.Additionally, PVAc can be further processed into polyvinyl alcohol (PVA)—a highly versatile polymer material.Because VAM is highly reactive, it can also copolymerize with other monomers, such as ethylene, to produce ethylene-vinyl acetate copolymer (EVA)—commonly known as EVA material—which is used in applications such as footwear, films, and hot-melt adhesives.

EVA, VAE and VAE emulsion share the same core chemical composition; the differences lie in naming conventions and product forms. EVA is the internationally recognized general term covering all ethylene-vinyl acetate copolymers, regardless of vinyl acetate (VA) content. VAE is a term commonly used in China to specifically refer to copolymers with high VA content (70%–95%), which typically exist in emulsion form. VAE emulsion represents the most prevalent commercial form of VAE, consisting of a dispersion of this copolymer in water. In short: VAE emulsion is the primary form of VAE products, while VAE itself is a specific type of EVA characterized by high VA content.  EVA (Ethylene-Vinyl Acetate Copolymer)EVA is the general term for polymer materials produced through the copolymerization of ethylene and vinyl acetate (VA). EVA takes on different forms depending on its VA content: when the VA content is below 40%, it typically appears as a solid resin, which can be processed into products such as films, footwear materials, and hot-melt adhesives; when the VA content ranges from 70% to 95%, it exists as an emulsion. EVA resin offers excellent flexibility, low-temperature resistance (with a brittleness temperature usually below -50°C), transparency, and aging resistance, making it widely used in applications such as foamed footwear materials, photovoltaic encapsulant films, wire and cable insulation, and packaging films. VAE (Vinyl Acetate-Ethylene Copolymer)VAE is a specific category within the broader EVA family, characterized by high VA content (typically 70%–95%). Due to this high VA content, VAE can form a stable aqueous dispersion (i.e., an emulsion) at room temperature, appearing milky white or slightly yellowish. In China, these high-VA ethylene-vinyl acetate copolymers are commonly referred to as VAE, whereas the solid forms with low VA content are customarily called EVA resin. While their chemical compositions are essentially identical, they differ in product form and application areas due to the variation in VA content. VAE Emulsion (Vinyl Acetate-Ethylene Copolymer Emulsion)VAE emulsion is an aqueous polymer dispersion produced via emulsion polymerization using vinyl acetate and ethylene as the primary raw materials; it is also simply referred to as VAE. It represents the most typical commercial form of VAE products and appears as a milky white, viscous liquid. Due to the incorporation of ethylene into its molecular chains, VAE emulsion exhibits permanent flexibility (resulting from internal plasticization, with no risk of plasticizer migration) as well as good resistance to acids, alkalis, and UV-induced aging. It typically has a minimum film-forming temperature below 5°C and demonstrates excellent adhesion to a wide range of materials, including fibers, wood, paper, plastics, and cement. It is primarily used in applications such as adhesives, architectural coatings, cement modifiers, paper coatings, and non-woven fabrics.

Core Functions and Working PrinciplesAll are powdered binders produced via spray-drying specific polymer emulsions. When added to dry-mix mortar, they redisperse into an emulsion upon contact with water and form a polymer film as the mortar cures, thereby significantly enhancing bond strength, flexibility, crack resistance, and water resistance. Fundamentally, they all modify inorganic cement-based materials with organic polymers, endowing the product with both strength and toughness. Core DifferencesThe primary distinction lies in the chemical composition of the base polymer: VAE is based mainly on vinyl acetate and ethylene; VAc-Acrylate incorporates acrylates into the vinyl acetate base; and Acrylate is a pure acrylate system. This results in tiered differences regarding water resistance, weather resistance, flexibility, and cost. Performance ranks from low to high as VAE < VAc-Acrylate < Acrylate, with costs increasing in the same order. VAE is the choice for standard, general-purpose needs, offering the best cost-performance ratio. VAc-Acrylate (or blends with pure acrylates) is selected when improved water resistance and flexibility are required and the budget allows. Acrylate is chosen for harsh outdoor environments where weather resistance and waterproofing demands are extremely high. VAE Copolymer Redispersible Polymer Powder (VAE Copolymer RDP)VAE copolymer redispersible polymer powder is a powdered polymer produced by spray-drying an emulsion of vinyl acetate (VAc) and ethylene (E). Its core chemical composition is a vinyl acetate-ethylene copolymer. This type of powder exhibits excellent adhesion to porous mineral substrates such as cement and concrete, significantly improving mortar flexibility, workability, and bond strength. With a balance of good overall performance and cost-effectiveness, it is currently the most widely used and best-value type of redispersible polymer powder on the market. Its main limitation is relatively restricted hydrolysis resistance and durability in environments characterized by long-term dampness or high alkalinity. Typical applications include tile adhesives, base-coat mortars for external thermal insulation systems (ETICS), interior wall putties, and repair mortars. Representative brands and models include WACKER’s 5044N and Zhuonuo’s RDP-503. Vinyl Acetate-Acrylate Copolymer Redispersible Polymer Powder (VAc-Acrylate Copolymer RDP)VAc-Acrylate copolymer RDP is a powdered polymer produced by spray-drying a copolymer of vinyl acetate (VAc) and acrylate monomers (such as butyl acrylate). By incorporating acrylate segments into the vinyl acetate backbone, this type of RDP offers superior water resistance and flexibility compared to standard VAE copolymer RDPs; its performance profile and cost generally fall between general-purpose VAE and high-performance pure acrylate RDPs. In practical applications, blending VAc-Acrylate (or VAE) RDP with pure acrylate RDP can sometimes yield synergistic effects, reducing mortar water demand and shortening setting times while enhancing bond strength after water immersion. A representative model is SETAKY-745N7, which is based on a vinyl acetate/ethylene/acrylate copolymer. Acrylate Copolymer Redispersible Polymer Powder (Acrylate Copolymer RDP)Acrylate copolymer RDP is a powdered polymer produced by spray-drying a copolymer of pure acrylate monomers (such as methyl methacrylate and butyl acrylate). This type of RDP exhibits exceptional water resistance, weatherability, UV aging resistance, and chemical resistance, alongside outstanding bond strength and flexibility. It represents the highest-performing category of redispersible polymer powders but also commands a higher cost, placing it in the high-end product range. Due to its excellent outdoor durability, it is particularly suitable for applications requiring high standards of exterior wall decoration and protection, such as premium external thermal insulation finishing system (ETICS) coatings, high-performance waterproof mortars, and sealants. Representative brands and models include the MP2050 and FX3250 acrylic copolymer series from KAWA INTERNATIONAL.