Pressure sensitive hot-melt adhesive system
AssigneeMinnesota Mining and Manufacturing Company
InventorsHarry A. Loder, Charles A. Mathna
Life of this patent
Estimating the term…
Abstract
A hot melt adhesive system which has pressure-sensitive adhesive characteristics at room temperature comprising a heat-activatable hot melt adhesive containing therein inherently tacky elastomeric copolymer microspheres.
Claims9
A hot melt adhesive system having pressure sensitive adhesion at ordinary room temperature conditions which is capable of forming a permanent bond at elevated temperatures comprising a blend of a heat-activatable adhesive, capable of forming a substantially permanent bond at elevated temperatures, said adhesive having dispersed therein discrete tacky elastomeric copolymer microspheres, said microspheres consisting essentially of
- a. about 90 to about 99.5 percent by weight of one or more oleophilic, water-emulsifiable alkyl acrylate esters, at least one of said esters being selected from the group consisting of iso-octyl acrylate, 4-methyl-2-pentyl acrylate, 2-methylbutyl acrylate, and sec-butyl acrylate and correspondingly
- b. about 10 to about 0.5 percent by weight of one or more monomers selected from the group consisting of trimethylamine methacrylimide, trimethylamine p-vinyl benzimide, ammonium acrylate, sodium acrylate, N,N-dimethyl-N-(.beta.-methacryloxyethyl)ammonium propionate betaine, 1,1-dimethyl-1-(2-hydroxypropyl) amine methacrylimide, 4,4,9-trimethyl-4-azonia-7-oxo-8-oxa-9-decene-1-sulphonate, 1,1-dimethyl-1-(2,3-dihydroxypropyl)amine methacrylimide, and maleic anhydride.
An article comprising a sheet material having a coating on at least one surface thereof, said coating comprising a hot melt adhesive system having pressure sensitive adhesion at ordinary room temperature, said system comprising a blend of a heat-activatable adhesive capable of forming a substantially permanent bond at elevated temperatures, and dispersed therein discrete, tacky, elastomeric copolymer microspheres, said microspheres consisting essentially of
- a. about 90 to about 99.5 percent by weight of one or more oleophilic, water-emulsifiable alkyl acrylate esters, at least one of said esters being selected from the group consisting of iso-octyl acrylate, 4-methyl-2-pentyl acrylate, 2-methylbutyl acrylate, and sec-butyl acrylate and correspondingly
- b. about 10 to about 0.5 percent by weight of one or more monomers selected from the group consisting of trimethylamine methacrylimide, trimethylamine p-vinyl benzimide, ammonium acrylate, sodium acrylate, N,N-dimethyl-N-(.beta.-methacryloxyethyl)ammonium propionate betaine, 1,1-dimethyl-1-(2-hydroxypropyl) amine methacrylimide, 4,4,9-trimethyl-4-azonia-7-oxo-8-oxa-9-decene-1-sulphonate, 1,1-dimethyl-1-(2,3-dihydroxypropyl) amine methacrylimide, and maleic anhydride,
- said microspheres being dispersed in said heat-activatable adhesive such that at least a portion thereof are present at the surface of said coating.
A hot melt adhesive system having pressure sensitive adhesion at ordinary room temperature conditions which is capable of forming a permanent bond at elevated temperatures comprising a heat-activatable adhesive capable of forming a substantially permanent bond at elevated temperatures having dispersed therein a mixture of discrete tacky elastomeric copolymer microspheres and a tackifying agent which is compatible with said microspheres and capable of increasing the tack thereof, said microspheres consisting essentially of
- a. about 90 to about 99.5 percent by weight of one or more oleophilic, water-emulsifiable alkyl acrylate esters, at least one of said esters being selected from the group consisting of iso-octyl acrylate, 4-methyl-2-pentyl acrylate, 2-methylbutyl acrylate, and sec-butyl acrylate and correspondingly
- b. about 10 to about 0.5 percent by weight of one or more monomers selected from the group consisting of trimethylamine methacrylimide, trimethylamine p-vinyl benzimide, ammonium acrylate, sodium acrylate, N,N-dimethyl-N-(.beta.-methacryloxyethyl) ammonium propionate betaine, 1,1-dimethyl-1-(2-hydroxypropyl) amine methacrylimide, 4,4,9-trimethyl-4-azonia-7-oxo-8-oxa-9-decene-1-sulphonate, 1,1-dimethyl-1-(2,3-dihydroxypropyl) amine methacrylimide, and maleic anhydride.
Dependencies are inferred from the claim text.