Patent GB-1219641-A (GB)
Title: Synthetic polymer laminate
Inventor: GLINIECKI VERN LOUIS
IPC: B32B27/00
Filed: 1968-01-03
Abstract: 1,219,641. Laminates. DOW CHEMICAL CO. 3 Jan., 1968 [10 Jan., 1967], No. 432/68. Heading B5N. [Also in Divisions B1-B2] A method of making a laminate of a vinyl chloride polymer comprises making a sheet of a vinyl chloride polymer, the vinyl chloride polymer consisting essentially of (a) polyvinyl chloride having a solution viscosity of from 1À5 to 3 centipoises measured in a 2% by weight solution in o-dichlorobenzene at 120 C., or (b) a copolymer of vinyl chloride with up to 20 weight per cent of methyl methacrylate, ethyl acrylate, vinyl acetate, methyl styrene, diethyl maleate, acrylonitrile, butadiene, ethyl vinyl ether, vinyl propionate, vinyl pimelate or vinyl crotonate or (c) a blend of polyvinyl chloride as set forth in (a) with (i) from 3 to 30% by weight (based on the blend of polymer) of a copolymer as set forth in (b), or of 30% by weight of the blend of a copolymer of 80% by weight methyl methacrylate and 20% by weight ethyl acrylate, or of 20% by weight of the blend of a copolymer of 78% by weight methyl methacrylate and 22% by weight ethyl acrylate, or (ii) from 5 to 25% by weight of the blend of a copolymer of from 70 to 95% by weight of vinyl chloride with from 30 to 5% by weight of vinylidene chloride, or (iii) from 5 to 15% by weight of the blend of a copolymer consisting of 25% by weight of acrylonitrile, 10% by weight of butadiene and 65% by weight of styrene, or (iv) 40% by weight of the blend of a copolymer of 80% by weight of polyvinyl chloride having polymerized thereon 20% by weight of a mixture of 16% by weight of methyl styrene, 39% by weight of butadiene, 39% by weight of methyl methacrylate and 6% by weight of ethyl acrylate, or (v) minor portions of chlorinated polyethylene, or, an intimate mixture of (A) from 70 to 92% by weight of at least one vinyl chloride polymer consisting of at least 85% by weight of vinyl chloride and not more than 15% by weight of a different ethylenically unsaturated monomer copolymerizable therewith and (B) from 8 to 30% by weight of a copolymer of a mixture of monomers consisting of (C) from 30 to 50% by weight of a conjugated diolefin, (D) from 10 to 45% by weight of an alkenyl aromatic compound, (E) from 15 to 55% by weight of a methyl or ethyl ester of acrylic or methacrylic acid and (F) from 6 to 12% by weight of acrylonitrile or methacrylonitrile, the amount of F being expressed as a percentage of the total of C, D, E and F and the amount of each of C, D and E being expressed as a percentage of the total of C, D and E, applying to the vinyl chloride polymer sheet in heat plastified form a sheet of an alkenyl aromatic resinous copolymer of 50 to 90% by weight of an alkenyl aromatic monomer containing from 8 to 12 carbon atoms and having the vinyl group directly attached to the ring; from 10 to 34% by weight of acrylonitrile and from 0 to 20% by weight of polybutadiene, contacting the heat plastified sheet of alkenyl aromatic resinous copolymer with the sheet of vinyl chloride polymer under pressure sufficient to cause bonding of the vinyl chloride polymer to the alkenyl resinous copolymer and subsequently cooling the resultant composite sheet below the thermoplastic temperature of each layer. Specified alkenyl aromatic monomers are styrene and a mixture of styrene with t-butyl styrene. The alkenyl aromatic resinous copolymer sheet is preferably applied to the vinyl chloride polymer sheet as an extrudate.