High Adhesion Transparent Acrylic Thermoplastic Resin For PUR Adhesives

PUR adhesives are a special type of adhesive. Their molecular chains contain reactive groups such as urethane (-NHCOO-) and/or isocyanate (-NCO). These groups undergo irreversible chemical reactions with moisture in the air, exhibiting extremely high reactivity. PUR adhesives exhibit excellent adhesion to a wide range of materials, including porous materials such as wood, leather, fabric, paper, and ceramics, as well as smooth surfaces such as plastics, metals, glass, and rubber.

Acrylic resins used in polyurethane (PUR) adhesives are highly valued for their excellent adhesion to polar substrates, good film-forming properties, and outstanding UV and weathering resistance—properties that contribute to the durability and clarity of adhesive systems. Depending on their design, acrylic resins can be thermoplastic (providing tack, wet strength, and processing properties) or functional, such as hydroxylated acrylic resins, which chemically react with isocyanate groups in the polyurethane (PUR) to increase crosslink density, cohesion, and long-term performance. acrylic thermoplastic resin‘s adjustable glass transition temperature (Tg) allows for fine-tuning of flexibility or hardness, while acrylic thermoplastic resin ’s compatibility with polyurethane prepolymers ensures stable formulations with balanced viscosity and open time. These properties make acrylic resins key modifiers in polyurethane (PUR) adhesives for applications requiring high strength, heat and chemical resistance, and long-term stability, such as woodworking, laminating, packaging, and automotive applications.

Product Description

SA-528 is an high adhesion transparent thermoplastic solid acrylic  Resin, the main components of which are methyl methacrylate (MMA) and n-butyl methacrylate (n-BMA) polymers. It has the characteristics of low odor, good solubility, strong adhesion, good dispersibility and good weather resistance. Thermoplastic solid acrylic  resin SA-528 can be used in PUR adhesives to effectively balance the initial adhesion and melt fluidity of PUR adhesives. Its long molecular chain can improve the wettability of the colloid to the substrate and avoid stringing during application. The design of Tg=56℃ enables the resin to maintain rigidity at room temperature (ensuring storage stability), while rapidly softening at the standard PUR application temperature, achieving low-temperature coating and rapid film formation. The hydroxyl value is 7mgKOH/g, which ensures moderate cross-linking with isocyanate to avoid embrittlement of the adhesive layer, greatly improving the overall performance of the PUR adhesive.

‌Key Features‌

l Low odor

l Good solubility

l Strong adhesion

l Excellent dispersibility

l Excellent weather resistance

Recommended Applications‌

l Aadhesive

Physical Property

Solubility

Dissolution Rate

Acetone > Butanone > Ethyl acetate > Toluene > Butyl acetate > Xylene

Compatibility

It has good solubility with perchlorethylene resin, nitrocellulose, cellulose acetate butyrate, etc.

Packaging Details

25kgs/Bag

Storage

This product should be stored in a dry, ventilated place to avoid moisture.