The GW-102H designation identifies an aqueous vinyl acetate-ethylene copolymer emulsion in which the ethylene comonomer fraction exceeds
25 wt% on dry substance, producing a semi-crystalline, permanently flexible film without the use of external phthalate or adipate plasticizers. Primary specification data, determined in accordance with
ISO 3251 (gravimetric solids,
1 h at 105 °C),
ISO 976 (pH), and
ASTM D2196/
ISO 2555 (Brookfield RV viscosity, spindle #3,
20 rpm,
25 °C), are: solids content
54–56%, viscosity
500–3,000 mPa·s, and pH
4.5–5.5. The minimum film-forming temperature (MFFT) recorded on a Rhopoint gradient bar per
ISO 2115 is
0 °C, while the dried copolymer displays a glass transition midpoint of approximately
-15 °C by differential scanning calorimetry (
ISO 11357-2,
10 K/min). This high-ethylene architecture distinguishes GW-102H from low- and medium-ethylene VAE grades (ethylene
10–18%) and from poly(vinyl acetate) homopolymers, whose films require coalescing solvents or fugitive plasticizers to approach similar low-temperature flexibility and which absorb significantly more water under identical exposure: typical water uptake after
24 h immersion (
ISO 62) falls to
3–5%, compared with
20–25% for homopolymer and
10–12% for a
16%-ethylene VAE. The intrinsic hydrophobicity also retards alkaline hydrolysis, making the emulsion inherently more stable in cementitious environments and enabling formulations that meet the
REACH Annex XVII restriction on phthalates without post-cure remediation.
A full-scale 3-layer pouch laminator running a tandem extrusion lamination line with an in-line slot-die aqueous coater was evaluated at
150 m/min using GW-102H applied at
2.0 g/m² (dry) onto
20 µm corona-treated LDPE (
42 dyne/cm). Film coalescence occurred without heated carrier rolls because the MFFT of
0 °C was below ambient-on-web temperature, yet the emulsion required a dynamic surface tension below
35 mN/m (measured via
ASTM D3825 bubble pressure at
10 Hz) to avoid retraction on the low-energy surface; a 2-ethylhexyl sulfate anionic wetting aid was pre-dispersed at
0.3 wt% on wet emulsion. T-peel adhesion after secondary heat lamination to
12 µm metallized PET and
48 h conditioning at
23 °C/
50% RH reached
2.8–3.2 N/15 mm (
ASTM D1876-08) with cohesive failure within the VAE layer observed in
85% of bonded area. When
10 wt% of a rosin ester dispersion (softening point
85 °C) was incorporated to raise adhesion to non-corona PE, the blend MFFT rose to
5–8 °C, requiring substrate pre-heating to
30 °C via an IR panel (
60 °C emitter, dwell
3 s) to maintain film integrity; failure to pre-heat resulted in micro-crazing of the dry film and a peel strength drop to
1.0 N/15 mm. No tackifier addition is necessary for standard corona-treated PE, preserving a single-component system with a pot life exceeding
72 h in a closed recirculation loop monitored by a Marimex flow-through viscometer.
| Property | GW-102H (High-Et) | GW-105 (Medium-Et VAE) | PVAc Homopolymer |
|---|
| Ethylene content (wt% on dry) | >25 | 14–16 | 0 |
| Solids (ISO 3251) | 54–56% | 54–56% | 50–52% |
| Viscosity (Brookfield RV #3/20 rpm) | 500–3,000 mPa·s | 1,500–4,000 mPa·s | 8,000–20,000 mPa·s |
| MFFT (ISO 2115) | 0 °C | 5–6 °C | 16–18 °C |
| Tg DSC midpoint (ISO 11357-2) | -15 °C | +5 °C | +32 °C |
| Water absorption (24 h, ISO 62) | 3–5% | 10–12% | 20–25% |
| Elongation at break (ISO 37 Type 2) | >600% | 300–400% | <20% (brittle) |
| Coalescing solvent demand (on wet) | none at 0 °C film formation | 2–4% butyl glycol | 6–10% texanol |
What Makes High-Ethylene VAE Emulsion Superior for Low-Surface-Energy Substrates?
The ethylene-rich backbone reduces overall cohesive energy density, enabling wetting on untreated polypropylene (
30 dyne/cm) when the emulsion is applied with a dynamic contact angle below
60° at
0.1 s drop age; a Krüss BP100 tensiometer confirmed equilibrium surface tension of
42 mN/m at
10 Hz. In contrast, a medium-ethylene VAE with a film Tg of
+5 °C requires a coalescent that lowers interfacial tension but also softens the dried film, reducing heat resistance in downstream lamination to PET. GW-102H maintains a softening point above
120 °C (Kofler hot bench) while wetting automatically, thus meeting the
FDA 21 CFR 175.105 and
176.170 indirect food-contact requirements for laminated structures without migration of low-molecular-weight plasticizer.
Carpet Pre-Coat Rheology and Plasticizer-Free Tuft-Bind Compliance
A pre-coat compound for a 900 g/m² loop-pile nylon carpet was formulated on a Ross VMC-40 vacuum mixer:
100 parts GW-102H wet,
200 parts Omyacarb
5 µm CaCO₃,
0.2 parts associative polyurethane thickener (Borchi Gel 0620). Brookfield RV viscosity at
50 rpm was adjusted to
12,000 mPa·s for knife-over-roll application at
2.5 mm gap; the thickened system showed Newtonian plateau behavior up to
500 s⁻¹, preventing striations during doctoring. Tuft bind measured per
ASTM D1335 on the latex-backed carpet after
24 h conditioning was
5.8–6.5 kg. After
7 days at
70 °C in a forced-air oven simulating automotive interior aging, retention exceeded
72% (
4.5 kg), with no plasticizer volatilization. This compares with a conventional PVAc/DBP system where tuft bind drops below
2.5 kg under identical aging, failing
IMO FTP Code Part 2 fire-retardant integrity due to plasticizer migration into the face fiber. GW-102H is manufactured with a protective-colloid (polyvinyl alcohol) stabilization regime rather than a high-surfactant profile; extractable surfactant residue is below
0.5% by
ISO 787-11 hot toluene extraction, drastically reducing the risk of staining on vinyl flooring exposed to underfloor heating, as verified by
ISO 105-B02 xenon arc lightfastness testing (blue wool ≥
6).
Because the ethylene segments interrupt the regularity of the acetate blocks, amorphous domains dominate even after mechanical drawing. A 500 µm cast film of GW-102H subjected to
100% elongation at
300 mm/min (
ISO 527-3) retains transparency (haze
<5% per
ASTM D1003) and does not stress-whiten, unlike EVA copolymers with higher vinyl acetate. This feature is exploited in window film adhesive and laminated safety glass interlayers where optical clarity is critical. The absence of coalescent also eliminates VOC emission above
0.1 mg/m³ after
28 days in a
1 m³ chamber (
ISO 16000-6), qualifying the raw emulsion for Blue Angel RAL-UZ 113 certified low-emission floor adhesives.
In cementitious two-component waterproofing slurry (polymer-to-cement ratio
0.13, Type I 42.5 R Portland cement,
w/c = 0.35), GW-102H provides a crack-bridging ability exceeding
0.75 mm at
-10 °C (tested per
EN 14891 procedure A.5) without the addition of an acrylic superplasticizer. Open time of the mixed slurry remains workable for
55–65 min at
20 °C as monitored by a penetrometer cone drop, but high-alumina cements must be avoided because the increased calcium aluminate content accelerates emulsion destabilization, causing aggregate syneresis within
15 min. Adhesion after
28 days of water immersion (
EN 14891, concrete substrate) averages
0.65 MPa—a value that surpasses the
0.5 MPa threshold—with failure located in the concrete rather than the polymer film. The high ethylene content also reduces the saponifiable acetate density; when cured film is immersed in
1 M NaOH at
50 °C for
14 days, weight loss is limited to
6–8% compared with
30–35% for a low-ethylene VAE, confirming long-term alkaline durability required for external tanking.
When GW-102H Replaces Acrylic Latex in Cementitious Waterproofing
Although styrene-acrylic dispersions are traditionally chosen for their hydrolysis resistance, the GW-102H high-ethylene variant eliminates the need for coalescing butyl dioxitol entirely, reducing lacquer-like odors during confined-space application. Compressive strength development of the modified mortar at
7 days (
EN 196-1) attains
38 MPa, close to the unmodified control (
42 MPa), whereas a film-forming acrylic latex at the same polymer load depresses early strength to
28 MPa. The differential arises because ethylene-rich VAE does not excessively retard cement hydration, as verified by isothermal conduction calorimetry at
20 °C showing a main silicate peak at
8.2 h versus
9.0 h for the acrylic, reflecting a more open, less-barrier film around anhydrous grains.
Heat Resistance and Open-Time Conflicts in D4 Wood Adhesive Applications
For high-pressure laminate (HPL) bonding to 16 mm MDF panels in a hot press at
90 °C platen temperature, GW-102H was blended with
5% polymeric MDI (Desmodur VK 10) as crosslinker to meet
DIN EN 204 D4 durability classification. Creep resistance tested per
EN 14256 at
80 °C and
6.5 MPa sustained
24 h without measurable slip, exceeding the
BS 14256 requirement. However, the crosslinking reaction shortens the pot life substantially: viscosity monitored by a Brookfield RV at
25 °C rose from an initial
7,000 mPa·s to
15,000 mPa·s within
90 min and reached
45,000 mPa·s after
180 min, forcing a working window of less than
2 h in a non-cooled tote. Production-scale experience on a Buerkle HPL press line dictates that the mixed adhesive be held in a water-jacketed vessel at
15 °C to extend pot life to
3.5 h and that roller coater gaps be widened by
0.1 mm to accommodate the viscosity progression. A non-crosslinked GW-102H bond yields a
72 h gap-filling adhesion on HPL of
2.8 N/mm² dry (shear block,
ISO 6238), but fails the D4 boil test due to adhesive hydrolysis; therefore, selective crosslinking is inherently required when end-use classification demands bonded joints resisting boiling water for
6 h.
| Regulation /Standard | Status or Test Method | Relevant Property |
|---|
| REACH Annex XVII | No phthalate plasticizers; compliant | Intrinsic flexibility |
| FDA 21 CFR 175.105 | Adhesive use in indirect food contact | Dried film extractives <1% |
| FDA 21 CFR 176.170 | Paper and paperboard components | Passes extraction cell tests |
| EU 10/2011 | Migration limit for vinyl acetate monomer <10 mg/kg | Residual monomer <50 ppm |
| RoHS 2011/65/EU | Not intentional addition of Pb, Hg, Cd, Cr⁶⁺, PBB, PBDE | ICP-OES screen (EN 62321) |
| Blue Angel RAL-UZ 113 | VOC <0.1 mg/m³ after 28 d | ISO 16000-6 chamber test |
| ASTM D4236 | Chronic health hazard labeling exemption | No toxic solvents |
During adhesive removal and cleaning, GW-102H uncrosslinked films dissolve in
30% isopropanol/water within
15 min at
40 °C, enabling press roll maintenance without chlorinated solvents; crosslinked films require a dimethyl adipate-based stripper at
50 °C for
30 min, as is practical for industrial wipe-down.
