Vinyl acetate modified suspension polymer beads, adhesives made therefrom and a method of making
US5292844A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1993 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Jun 10, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a method of suspension polymerization of a pressure-sensitive acrylate copolymer bead having a glass transition temperature of 0.degree. C. or less which are storage stable in addition to being extrudable at temperature below about 340.degree. F. (171.degree. C.). The method comprises making a monomer-containing premix comprising (i) about 70 to about 98 parts by weight of an acrylic acid ester monomer of non-tertiary alcohol, the alcohol having from 1 to 14 carbon atoms, with the average number of carbon atoms being about 4 to about 12, (ii) about 1 to about 10 parts of a polar monomer copolymerizable with the acrylic acid ester, and (iii) about 1 to about 40 parts vinyl acetate monomer, wherein (i), (ii), and (iii) comprise 100 parts of the monomer-containing premix, (iv) about 0.01 to about 0 5 part by weight chain transfer agent, and (v) about 0.05 to about 1.0 part by weight free-radical initiator, wherein (iv) and (v) are each independently based upon 100 parts by weight total monomer content and wherein about 0.05 to about 30 parts by weight modifier moiety based upon 100 parts by weight total monomer content is present in one or more of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.