Back to results
US 7,531,595 B2Granted
Pressure-sensitive adhesive containing silica nanoparticles
Assignee3M Innovative Properties Company
InventorsKevin M. Lewandowski, Timothy D. Filiatrault, Kelly S. Anderson, Babu N. Gaddam, Eugene G. Joseph, Ying-Yuh Lu, John J. Stofko, Jr.
Life of this patent
Estimating the term…
Abstract
An adhesive composition comprising an emulsion polymer which comprises a (meth)acrylate copolymer and silica nanoparticles is described. The addition of the nanoparticles results in a significant increase in the overlap shear properties.
Claims23
A pressure-sensitive adhesive comprising:
- a) a polymer component comprising:
- i) 90 to 99 parts by weight of monomer units of an (meth)acrylic acid ester of non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms;
- ii) 1 to 10 parts by weight of monomer units of an acid functional monomer;
- iii) 0 to 10 parts by weight of monomer units of a second polar monomer;
- iv) 0 to 5 parts vinyl monomer units;
- and
- v) 0 to 1 part crosslinking agent;
- and
- b) 1 to 8 parts by weight, based on 100 parts of polymer, of silica nanoparticles having an average particle diameter of 9-25 nm with a length of 40-300 nm.
6 more elements
An emulsion comprising:
- (a) 30 to about 70 weight percent, based on the total weight of the emulsion, of a polymer phase comprising the polymerization reaction product of:
- i. 90 to 98 parts by weight of an (meth)acrylic acid ester of non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms;
- ii. 1 to 10 parts by weight of an acid functional monomer;
- iii. 0 to 10 parts by weight of a second, non-acid functional, polar monomer;
- iv. 0 to 5 parts by weight of vinyl monomer;
- v. optionally 0.01 to 1 part by weight of a crosslinking agent,
- vi. 0 to 0.5 parts by weight of a chain transfer agent
- vii. 1 to 8 parts by weight of silica nanoparticles having an average particle diameter of 9-25 nm with a length of 40-300 nm, based on 100 parts of polymer, wherein the sum of (i) through (vii) is 100 parts by weight, and
- (b) 30 to 70 weight percent of an aqueous phase comprising a surfactant, based on the total weight of the emulsion.
6 more elements
Dependencies are inferred from the claim text.