Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape
Assignee3M Innovative Properties Company
InventorsJun Fujita, Yorinobu Takamatsu, Sawako Kojima
Life of this patent
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Abstract
A pressure-sensitive adhesive composition is disclosed. The composition comprises a particulate polymer of a monomer mixture comprising (a) an alkyl (meth)acrylate monomer; (b) at least one of (b-1) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a linear alkyl group and (b-2) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a branched alkyl group; and (c) a monoolefmically unsaturated monomer having a ketone group with the alkyl group having a carbon number of 8 to 14. Pressure sensitive adhesive tapes incorporating such adhesive compositions are also described.
Claims11
A masking tape comprising a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition comprising (A) a particulate polymer of a monomer mixture comprising:
- from 20 to 55 mass % of (a) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 8 to 14,
- from 20 to 35 mass % of (b-1) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a linear alkyl group,
- from 5 to 35 mass % of (b-2) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a branched alkyl group, and
- from 2 to 5 mass % of (c) a monoolefinically unsaturated monomer having a ketone group, said percentages each being based on the total amount of the monomers (a), (b-1), (b-2) and (c), wherein the monomer mixture is polymerized in the presence of water;
- and
- (B) an initiator having low solubility in water
- wherein a thickness of the pressure-sensitive adhesive layer ranges from 3 μm to 150 μm.
A masking tape comprising a substrate and a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition comprising a particulate polymer of a monomer mixture comprising:
- from 20 to 55 mass % of (a) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 8 to 14,
- from 20 to 35 mass % of (b-1) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a linear alkyl group,
- from 5 to 35 mass % of (b-2) an alkyl (meth)acrylate monomer with the alkyl group having a carbon number of 15 to 24 and the alkyl group being a branched alkyl group, and
- from 2 to 5 mass % of (c) a monoolefinically unsaturated monomer having a ketone group,
- said percentages each being based on the total amount of the monomers (a), (b-1), (b-2) and (c),
- wherein a thickness of the pressure-sensitive adhesive layer ranges from 3 μm to 150 μm.
Dependencies are inferred from the claim text.