摘要:
Optionally reinforced moulding compositions with high impact strength comprising polyamides and graft products of (co)polymers of butadiene and grafted units of methyl(meth)acrylate.
摘要:
Block copolyesters based on polyalkylene terephthalates which contain polyene blocks show an extremely low deformation even when they are processed into thin articles. They still have a crystallinity which is decreased by less than the ratio corresponding to the polyene portion.
摘要:
Reinforced polyamide moulding blends with improved impact strength containing as modifying agent a graft product consisting of a polyolefine as graft-substrate and grafted units of unsaturated carboxylic acids and/or derivatives therefrom and which graft product is prepared by a special oxidation process.
摘要:
A process for the production of modified polypropylene particles by polymerizing vinyl monomers in aqueous suspension wherein (a) an aqueous suspension is prepared which, based on 100 to 2000 parts by weight of water, contains 100 parts by weight of polypropylene particles, 4 to 30 parts by weight of a polar vinyl monomer and based on 100 parts by weight of the monomer, 0.1 to 10 parts by weight of a radical chain polymerization initiator which has a half life of at least 2 h at a temperature of 80.degree. to 135.degree. C. and 10 to 1200 parts by weight of an organic solvent which is capable of swelling polypropylene, of which the boiling point at 760 Torr is at least 100.degree. C. and which is miscible with the monomers in any proportion; (b) the aqueous suspension is heated without decomposition of the initiator, the polypropylene being swollen and the monomer penetrating into the polypropylene, after which (c) the aqueous suspension is kept at temperatures of .gtoreq.85.degree. C. until polymerization of the monomer has ceased. The modified polypropylene is used to improve the mechanical properties of unmodified, optionally glass-fibre-reinforced polypropylene.
摘要:
High impact resistant optionally reinforced moulding compositions consisting of polyamide and a graft product of polybutadiene and grafted units of t-butyl acrylate and an acrylic acid ester with 1-4 C-atoms in the alcoholic moiety.
摘要:
A homogeneous thermoplastic mixture comprising (A) from 85 to 99.5% by weight of a propylene-ethylene copolymer containing from 0.5 to 15% by weight of copolymerized ethylene units and having a melt index of from 1.0 to 30 g/min at 230.degree. C. and under a load of 5 kg; and (B) from 0.5 to 15% by weight of a saturated diorganopolysiloxane having a viscosity of from 30,000 to 80,000 Cst at 20.degree. C.The mixtures of the present invention are particularly suitable for the manufacture of elastic polypropylene based moulded articles which are dimensionally stable in heat.
摘要:
The present invention is concerned with thermoplastic terephthalic acid copolyesters which crystallize more rapidly than homopolyethylene terephthalate and are based on a diol component which is about 98 to 99.9 mol % of ethylene glycol and the balance 2-ethylhexane-1,3-diol. The acid component may be up to about 10.0 mol % of other than terephthalic acid or its dimethyl ester.This invention is also concerned with a process of synthesizing such copolyesters by esterifying or transesterifying the acid and diol components between about 150.degree. and 250.degree. C. in the presence of appropriate catalysts. The condensation product may be subject to polycondensation at about 200.degree. to 300.degree. C. under reduced pressure in the presence of esterification catalysts. In a preferred embodiment the 2-ethylhexane-1,3-diol is added after the initial reaction between the acid component and the ethylene glycol and preferably after the degree of polycondensation is greater than 4.
摘要:
Process for the preparation of copolyamides from adipic acid, terephthalic acid and hexamethylene diamine containing 25-48% by weight of units of hexamethylene terephthalamide, by precondensing the monomers at a temperature of at least 250.degree. C. and a pressure of at least 35 bar and completing the polycondensation in the usual manner.
摘要:
This invention relates to thermoplastic molding compositions having improved impact strength at low temperatures comprising polyamides and grafted, at least partially crosslinked diene rubbers and/or acrylate rubbers having a bimodal rubber particle size distribution.