Adhesive acrylic copolymers with a broad molecular weight distribution
US5292842A · kind A · utility
14Cited by
15References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1993 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Feb 26, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2301/302
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Acrylic copolymer PSA compositions having enhanced peel strength without substantially decreasing shear properties have been formulated by producing the copolymer with a broad molecular weight distribution such that the ratio M.sub.w /M.sub.n is above 6, preferably above 10. The alkyl (meth)acrylate and (meth)acrylic acid monomers are emulsion polymerized over a temperature profile wherein the difference between the maximum and minimum polymerization temperatures is at least about 40.degree. C. and less than about 70.degree. C., preferably using a redox initiator system such as bromate/bisulfite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.