Process for producing pressure-sensitive adhesive sheet

Details Process for producing pressure-sensitive adhesive sheet Process for producing pressure-sensitive adhesive sheet

1999-08-04

2000-12-05

Cameron, Erma

Coating processes

Coating remains adhesive or is intended to be made adhesive

Pressure sensitive adhesive

4273897, 4273935, B05D 510

Patent

active

061563781

ABSTRACT:
A process for producing a pressure-sensitive adhesive sheet using an aqueous resin emulsion is disclosed. The aqueous resin emulsion is an aqueous resin emulsion that dispersed particles have a weight average particle diameter of 0.3 .mu.m or smaller and a ratio of the weight average particle diameter thereof to an arithmetic average particle diameter thereof [(weight average particle diameter)/(arithmetic average particle diameter)] is 1.0 to 1.5. The resin contained in the aqueous resin emulsion preferably comprises an alkyl (meth)acrylate monomer unit (a) having 4 to 12 carbon atoms in the alkyl moiety, an .alpha.,.beta.-ethylenically unsaturated carboxylic acid monomer unit (b), and a radically polymerizable monomer unit (c) having a cyclic structure, other than the monomer units (a) and (b), the proportions of the monomer unit (a), the monomer unit (b), and the monomer unit (c) being 45 to 97% by weight, 0.1 to 10% by weight, and 2.9 to 30% by weight, respectively, with the total amount of those units being 100% by weight. The aqueous resin emulsion preferably contains a nonionic surfactant. The pressure-sensitive adhesive sheet obtained by the process has a property such that the pressure-sensitive adhesive layer thereof is less apt to blush even upon contact with water by immersion in water, moisture absorption, etc.

REFERENCES:
patent: 4419481 (1983-12-01), Schwartz
XP-002120553--6001 Chemical Abstracts 112 (1990).
European Search Report, Oct. 1999, FOR EP978551.

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