摘要:
Copolymers of from 65 to 75%, by weight, of .alpha.-methyl styrene and from 35 to 25%, by weight, of .alpha.-methyl styrene and from 35 to 25%, by weight, of acrylonitrile, obtainable by radical emulsion polymerization, the monomers being metered in during the course of the polymerization, wherein the molar ratio: ##EQU1## of the unreacted monomers in the reaction mixture is maintained during the metering phase between 0.7 and 1.25.
摘要:
This invention relates to thermoplastic moulding compositions of the ABS-type produced in emulsion and having improved properties in relation to known ABS-moulding compositions, particularly extreme toughness coupled with ready processibility and high surface gloss.
摘要:
This invention relates to graft rubbers obtained by the radical polymerization of one or more vinyl-group-containing monomers in the presence of at least one rubber, the polymerization reaction being carried out in the presence of from 0.001 to 1.0% by weight (based on solid graft product) of at least one compound corresponding to the following formula (I): ##STR1## in which X=CL or NO.sub.2Y.sup.1, Y.sup.2 =H, C.sub.1 -C.sub.10 -alkyl, NO.sub.2, F, Cl, Br, and to the use of the graft rubbers according to the invention for the production of rubber-modified thermoplastic moulding compositions.
摘要:
A molding composition having good surface gloss, high elongation at break and good thermoplastic processability is disclosed. The composition contains (A) a graft polymer that is obtained by free-radical polymerization of resin-forming vinyl monomers in the presence of rubber in latex form, (B) a copolymer of styrene and acrylonitrile and an optional (C) a resin selected from the group consisting of polycarbonates, polyester-carbonates, polyesters and polyamides. The preparation of the graft polymer is characterized in that (i) before the start of the grafting polymerization reaction the rubber latex is brought to a pH of 9 to 11, (ii) the redox initiator components are employed in amounts of 0.1 to 2.5 wt. % (based on the monomers metered in) and (iii) during the entire grafting polymerization reaction the pH remains constant±0.5 and in the range of 11.0 to 8.8, and (iv) the temperature difference between the start and end of the reaction is at least 10° C.
摘要:
Glass-fiber-reinforced ABS-molding compositions comprising(a) from 60 to 98% by weight of an ABS-plastic;(b) from 2 to 40% by weight of sized glass fiber; and(c) from 0 to 5% by weight of one or more additives,the glass fiber being treated with a size which contains a polymer containing epoxide groups and a copolymer of, on the one hand, styrene, nuclear-methylated styrene, .alpha.-methyl styrene, methylmethacrylate or a mixture thereof and, on the other hand, acrylonitrile.
摘要:
ABS-moulding compositions consisting of a thermoplastic copolymer and a graft polymer with rubber-like graft base exhibit an improved flame resistance if the total mixture contains a compound corresponding to the formulae ##STR1## polymerized into one or both components, wherein R.sub.1 represents C.sub.2 -C.sub.6 -alkylene,R.sub.2 represents hydrogen or methyl,R.sub.3 represents a direct bond or C.sub.1 -C.sub.4 -alkylene, andR.sub.4 represents hydrogen, methyl or CH.sub.2 --OOC--CH.sub.2 --CO--CH.sub.3.
摘要:
ABS-polycarbonate mixtures consisting of an aromatic polycarbonate A, a graft polymer B having a rubber-like graft base and optionally a thermoplastic copolymer C have improved flame resistance if the total mixture contains a compound corresponding to the formulae ##STR1## wherein R.sub.1 represents C.sub.2 -C.sub.6 alkylene,R.sub.2 represents hydrogen or methyl,R.sub.3 represents a direct bond or C.sub.1 -C.sub.4 alkylene, andR.sub.4 represents hydrogen, methyl orCH.sub.2 --OOC--CH.sub.2 --CO--CH.sub.3Polymerized in B or C or in B and C.
摘要:
The invention relates to flame-resistant ABS moulding materials containing a fluoro-organic polymer besides customary flameproofing additives and to a process for their manufactures.
摘要:
Melts of Urethane-modified oligoesters and 1 or polyesters can easily be dispersed in an aqueous phase in the presence of a dispersing agent combination comprising a polyether-modified polyester and a non-ionic dispersing agent having a particular HLB value.
摘要:
An emulsifier composition comprising (a) a non-ionic emulsifier having an HLB-value of about 10 to 20 and (b) a polyoxyalkylene-polyester of which about 5 to 50% by weight comprises polyoxyalkylene radicals. It may be used in admixture with phosphoric acid esters, serving to reduce foaming and prevent settling of aqueous suspensions such as cement and calcium sulfate slurries.