Pressure-sensitive adhesive composition and pressure-sensitive a

Details Pressure-sensitive adhesive composition and pressure-sensitive a Pressure-sensitive adhesive composition and pressure-sensitive a

1997-07-10

1998-12-22

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

428343, 428355, C08F 830

Patent

active

058521194

ABSTRACT:
Disclosed are a pressure-sensitive adhesive composition comprising a reactive mixture of a relatively low molecular weight acrylic prepolymer containing highly reactive hydroxyl groups in the molecule thereof which is obtained by copolymerizing two alkyl acrylate monomers satisfying a specific relationship and, as a chain extender, a polyfunctional isocyanate mainly exhibiting bifunctionality; a pressure-sensitive adhesive composition comprising the above reactive mixture and a relatively high molecular weight polymer component; and pressure-sensitive adhesive sheets having a pressure-sensitive adhesive layer comprising those pressure-sensitive adhesive compositions. Because the molecular chain of the acrylic prepolymer is extended efficiently, the amount of an organic solvent required for viscosity adjustment can be decreased.

REFERENCES:
patent: 5604035 (1997-02-01), Kojima et al.

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