Abstract:
A process for the preparation of heat-sensitive latices, characterised in that a mixture of 45-80 % by weight of butadiene, 10-45 % by weight of acrylonitrile, 0-20 % by weight of styrene, 0.5-10 % by weight of (meth)acrylic acid, 2-10 % by weight of (meth)acrylamide and 0-5 % by weight of (meth) acrylamido-N-methylolmethyl ether is polymerised on radical initiators in an aqueous emulsion in the presence of 1-10 % by weight of an emulsifier or a mixture of several emulsifiers, only a small proportion of the total quantity of emulsifier being present at the beginning of polymerisation, the remainder being added in the course of polymerisation.
Abstract:
PROCESS FOR PRODUCING SULPHUR-MODIFIED CHLOROPRENE POLYMERS HAVING A PREDETERMINED MOONEY VISCOSITY BY POLYMERISING CHLOROPRENE AND UP TO 20% BY WEIGHT OF A COMONOMER IN AQUEOUS EMULSION WITH A PEPTISING AGENT, WHERE COAGULATION OF THE LATEX IS EFFECTED IMMEDIATELY AFTER ADDITION OF THE PEPTISING AGENT AND THAT THE POLYMER IS DRIED UNTIL A MOONEY VISCOSITY OF 30 TO 10 MOONEY UNITS ABOVE THE POTENTIAL MINIMUM IS OBTAINED.
Abstract:
in which R1 represents H or CH3; R2 represents H or an alkyl group having 1 to 8 carbon atoms; R3 represents H or an alkyl group or a carboxyalkyl group having 1 to 10 carbon atoms; and R4 represents H or CH3, and 95 TO 50 PARTS BY WEIGHT, OF A POLYMERISED MIXTURE OF I. STYRENE, NUCLEAR OR SIDE CHAIN ALKYL STYRENE, METHACRYLIC ACID ALKYL (C1 - C4) ester or mixtures thereof II. ACRYLONITRILE, METHACRYLONITRILE, AN ALKYL (C1 - C4) ester of methacrylic or fumaric acid, or mixtures thereof, IN A WEIGHT RATIO OF (I) : (II) 100 : 0 TO 60 : 40 AT LEAST 20% OF THE TOTAL POLYMERISED MIXTURE BEING GRAFT-POLYMERISED ONTO THE ELASTOMER IN AQUEOUS DISPERSION.
Thermoplastic moulding compositions which comprise: 5 to 50 parts by weight, of an elastomeric copolymer of 94 to 99.5 parts by weight of an acrylic acid alkyl ester having 4 to 10 carbon atoms in the alkyl group and 0.5 to 6 parts by weight of an acrylamide- or methacrylamide-N-alkylol compound of the general formula (I)
Abstract:
A composition comprising a) a crosslinked copolymer of chloroprene and a diester of an unsaturated carboxylic acid and b) a benzene-solution chloroprene and a process for producing this composition.