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US 2008/0176996 A1Published application
Emulsion based polymer adhesive
OwnerRalph Craig Eveninventor
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Abstract
This invention relates to a latex polymer that when used in adhesive formulations exhibits a favorable level of peel and shear balance as well as a resistance to water whitening.
Claims8
A latex polymer prepared by a process comprising:
- (a) preparing by emulsion polymerization a first stage polymer of at least one ethylenically unsaturated monomer, wherein said first stage polymer comprises:
- i) at least 40% of a monomer having a homopolymer Tg of less than 40° C.;
- and
- ii) 10 to 50% of a soft hydrophilic, nonionic monomer having a homopolymer Tg of less than 30° C.;
- (b) dispersing in the first stage polymer, additional ethylenically unsaturated monomer comprising at least one monomer having at least two sites of alpha, beta-ethylenic unsaturation, whereby the additional monomer swells the first stage polymer, and
- (c) polymerizing the additional monomer within the monomer-swollen first stage polymer.
3 more elements
Dependencies are inferred from the claim text.