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US 4,994,322 AGranted
Pressure-sensitive adhesive comprising hollow tacky microspheres and macromonomer-containing binder copolymer
AssigneeMinnesota Mining and Manufacturing Company
InventorsJoaquin Delgado, Roger W. Leinen, Spencer F. Silver
Life of this patent
Estimating the term…
Abstract
A repositionable pressure-sensitive adhesive comprising from about 70% to about 99% hollow, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising at least one alkyl acrylate or alkyl methacrylate ester, a majority of the microspheres having one or more interior voids having a diameter of at least about 10% of the diameter of the microsphere, and correspondingly, from about 30% to about 1% of a binder copolymer comprising an elastomeric polymeric backbone having pendant therefrom high Tg polymeric moieties.
Claims16
A repositionable pressure-sensitive adhesive comprising from about 70% to about 99% of:
- (a) hollow, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising at least one alkyl acrylate or alkyl methacrylate ester, a majority of the microspheres having one or more interior voids having a diameter of at least about 10% of the diameter of the microsphere;
- and
- (b) correspondingly, from about 30% to about 1% of a binder copolymer comprising an elastomeric polymeric backbone having pendant therefrom polymeric moieties, said backbone containing repeating A and C monomers and from about 1% to about 20% B monomers, wherein
- A is a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms, with the average number of carbon atoms being about 4-12, said A monomer comprising from about 50% to about 98% of said monomers;
- B is a polar monomer copolymerizable with said monomeric acrylic acid ester;
- C is a monomer having the general formula X-(Y).sub.n -Z, wherein X is a vinyl group copolymerizable with said A and B monomers,
- Y is a divalent linking group, where n is zero or 1, and
- Z is a monovalent polymeric moiety having a T.sub.g greater than 20.degree. C., and a molecular weight in the range of about 2,000 to about 30,000, and being essentially unreactive under copolymerization conditions, C comprising
- from about 1% to about 30% of said monomers, wherein said binder copolymer has a shear storage modulus of at least about 1.times.10.sup.5 Pascals at 3 Hz, and 22.degree. C.
6 more elements
A repositionable pressure-sensitive adhesive comprising from about 70% to about 99% of:
- (a) hollow, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising
- (i) at least about 85 parts by weight of at least one alkyl acrylate or alkyl methacrylate ester;
- and
- (ii) up to about 15 parts by weight of at least one polar monomer, a majority of the microspheres having one or more interior voids having a diameter of at least about 30% of the diameter of the microsphere, and
- (b) correspondingly, from about 30% to about 1% of a binder copolymer comprising an elastomeric polymeric backbone having pendant therefrom polymeric moieties, said backbone containing repeating A and C monomers and from about 1% to about 20% B monomers, wherein
- A is a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms, with the average number of carbon atoms being about 4-12, said A monomer comprising from about 50% to about 98% of said monomers;
- B is a polar monomer copolymerizable with said monomeric acrylic acid ester;
- C is a monomer having the general formula X-(Y).sub.n -Z, wherein X is a vinyl group copolymerizable with said A and B monomers,
- Y is a divalent linking group, where n is zero or 1, and
- Z is a monovalent polymeric moiety having a T.sub.g greater than 20.degree. C., and a molecular weight in the range of about 2,000 to about 30,000, and being essentially unreactive under copolymerization conditions, C comprising from about 1% to about 30% of said monomers,
- wherein said binder copolymer has a shear storage modulus of at least about 1.times.10.sup.5 Pascals at 3 Hz and 22.degree. C.
8 more elements
An organic dispersion comprising an organic carrier liquid and
- (a) hollow, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising at least one alkyl acrylate or alkyl methacrylate ester, a majority of the microspheres having one or more interior voids having a diameter of at least about 10% of the diameter of the microsphere;
- and
- (b) a binder copolymer comprising an elastomeric polymeric backbone having pendant therefrom polymeric moieties, said backbone containing repeating A and C monomers and from about 1% to about 20% B monomers, wherein
- A is a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms, with the average number of carbon atoms being about 4-12, said A monomer comprising from about 50% to about 98% of said monomers;
- B is a polar monomer copolymerizable with said monomeric acrylic acid ester;
- C is a monomer having the general formula X-(Y).sub.n -Z, wherein X is a vinyl group copolymerizable with said A and B monomers,
- Y is a divalent linking group, where n is zero or 1, and
- Z is a monovalent polymeric moiety having a T.sub.g greater than 20.degree. C., and a molecular weight in the range of about 2,000 to about 30,000, and being essentially unreactive under copolymerization conditions, C comprising from about 1% to about 30% of said monomers,
- wherein said binder copolymer has a shear storage modulus of at least about 1.times.10.sup.5 Pascals at 3 Hz and 22.degree. C.
6 more elements
Dependencies are inferred from the claim text.