Aqueous latex copolymer compositions
AssigneeImperial Chemical Industries PLC
InventorsJohn C. Padget, Donald H. McIlrath
Life of this patent
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Abstract
Aqueous latex composition for use as a contact adhesive comprising a copolymer A and a copolymer B where A is an amorphous copolymer which comprises units of certain selected monomers preferably including vinylidene chloride, an internally plasticizing monomer like 2-ethylhexyl acrylate, optionally vinyl chloride, and optionally a copolymerizable acid, and has Tg within the range -50.degree. to <0.degree. C., and B is a crystalline polymer which comprises units of vinylidene chloride and preferably at least one of an alkyl acrylate, alkyl methacrylate and vinyl chloride, and optionally a copolymerizable acid, and has a Tg of not more than 30.degree. C.
Claims31
An aqueous latex composition comprising at least one copolymer A and at least one copolymer B characterised in that:
- A is an amorphous copolymer comprising polymerised units (a) of at least one monomer selected from alkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, alkoxyalkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, vinylidene chloride, acrylonitrile, styrene, vinyl acetate, and vinyl ethyl ether, said copolymer A including units of at least one internally plasticising comonomer, and which copolymer has a Tg in the range -50 to <0.degree. C.;
- and
- B is a crystalline copolymer comprising polymerised units of vinylidene chloride;
- and which copolymer has a Tg which is not more than 30.degree. C.;
- and wherein the dry weight ratio of the at least one copolymer A:
- the at least one copolymer B is from 95:5 to 10:90, and wherein said composition provides contactable layers after drying.
An aqueous latex composition according to any one of the preceding claims characterised in that said at least one copolymer B comprises polymerised units of vinylidene chloride and polymerised units (b) of at least one comonomer selected from alkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, alkoxyalkyl acrylates and methacrylates having 1 to 12 carbon atoms in the alkyl group, vinyl chloride, styrene, acrylonitrile, vinyl acetate, vinyl ethyl ether, ethylene, cis and trans 1,3-butadiene, cis and trans isoprene, cis and trans chloroprene, 1-decene, 1-pentene and 1-octene.
An aqueous latex composition according to any one of the preceding claims characterised in that at least one of said at least one copolymer B in said composition comprises polymerised units of at least one copolymerisable ethylenically unsaturated acid.
An aqueous latex composition according to any one of the preceding claims characterised in that the dry weight ratio of the at least one copolymer A:
- the at least one copolymer B is from 90:10 to 10:90.
An aqueous latex composition according to any one of the preceding claims characterised in that the Tg of the at least one copolymer A is in the range -40 to -5.degree. C.
An aqueous latex composition according to any one of the preceding claims characterised in that the at least one copolymer A comprises 10 to 100 weight of polymerised units (a), 0 to 90 weight % of polymerised units of at least one internally plasticising comonomer other than one or ones forming polymerised units within the scope of (a), 0 to 50 weight % of polymerised units of vinyl chloride, and 0 to 10 weight % of at least one copolymerisable ethylenically unsaturated acid.
An aqueous latex composition according to any one of the preceding claims characterised in that the at least one copolymer A comprises 10 to 70 weight % of polymerised units of vinylidene chloride, 30 to 90 weight % of polymerised units of at least one internally plasticising comonomer, 0 to 50 weight % of polymerised units of vinyl chloride, and 0 to 10 weight % of polymerised units of at least one copolymerisable ethylenically unsaturated acid.
An aqueous latex composition according to any one of the preceding claims characterised in that the polymerised units of at least one internally plasticising comonomer in copolymer A are derived from n-butyl acrylate.
An aqueous latex composition according to any one of the preceding claims characterised in that the copolymer A has been prepared in the presence of a chain transfer agent.
An aqueous latex composition according to any one of the preceding claims characterised in that the Tg of the at least one copolymer B is in the range -50 to 30.degree. C.
An aqueous latex composition according to any one of the preceding claims characterised in that the at least one copolymer B includes polymerised units of at least one internally plasticising comonomer.
An aqueous latex composition according to any one of the preceding claims characterised in that the at least one copolymer B includes polymerised units of at least one comonomer(other than vinylidene chloride)which comonomer is not an internally plasticising comonomer.
An aqueous latex composition according to any one of the preceding claims characterised in that copolymer A and/or copolymer B comprises polymerized units of at least one copolymerisable ethylenically unsaturated acid which acid is an ethylenically unsaturated carboxylic acid or sulphonic acid.
An aqueous latex composition according to any one of the preceding claims characterised in that the copolymer A and/or the copolymer B comprises polymerised units of at least one type of comonomer to provide a partial cross-linking functionality.
An aqueous latex composition according to any one of the preceding claims characterised in that said latex composition includes at least one tackifying resin, which tackifying resin has been added in the form of a dispersion.
The use of an aqueous latex composition according to any one of the preceding claims as a contact adhesive-forming composition.
Dependencies are inferred from the claim text.