摘要:
A polyolefin resin composition comprising a polyolefin modified with an unsaturated carboxylic acid, at least one member selected from the group consisting of polyepoxides, polyisocyanates, and polyamines, and a reinforcement.
摘要:
Flame retardant reinforced with polyester resin compositions are disclosed glass fiber and a system of flame retardants represented by the following general formulas (I) and (II), together with antimony trioxide. The flame retardant system is a blend of 1-20 parts by weight of component (I), and 2-30 parts by weight of component (II), provided the weight ratio (I)/(II) of the flame retardant component (I) to (II) is in the range of 0.2
摘要:
A process for producing a polyester in a stable emulsion state, which comprises thermal polymerization of a bis(.omega.-hydroxyalkyl)terephthalate or an oligomer thereof in the form of finely divided particles dispersed in a silicone oil by using a graft polymer, as a dispersion stabilizer, constructed of both a polysiloxane and an acrylic polymer.
摘要:
A process for the production of polyester comprising at least 80% of an ethylene terephthalate repeating unit using as a starting material an ester compound made mainly of terephthalic acid and ethylene glycol or an oligomer thereof is disclosed. This process is characterized in that a prepolymer having an intrinsic viscosity of not more than 0.4 dl/g and a carboxyl terminal group concentration [COOH] of not more than 90.times.[.eta.].sup.-0.4 .mu.eq/g is fed to a final polymerization unit and polymerized in the form of a molten thin film having a thickness of from 0.005 to 0.15 mm.
摘要:
Reinforced resin compositions exhibiting excellent heat resistance and appearance, and containing by weight: (a) at least 30% of a polyethylene terephthalate-type resin, (b) 5 to 60% glass fiber, (c) 0.03 to 5% of one or more salts of organic carboxylic acids with metals of the Groups Ia and IIa of the Periodic Table, and (d) 0.1 to 20% of a sorbitan derivative are disclosed. Optionally liquid or solid paraffin or polyethylene wax is incorporated in an amount of 0.3 to 5% based on the total composition may be incorporated if a white article is desired.Molded articles prepared from these compositions, high in heat resistance and uniform appearance, even if the thickness of the molded article is small or uneven or the molding operation is carried out at a relatively low mold temperature, are also disclosed. Molding temperature dependence and thickness dependence on the heat distortion temperature of the molded article are remarkably improved as well.
摘要:
Disclosed is a polyester composition obtained by blending, with a polyester comprising at least 80% by mole of ethylene terephthalate units, (1) an epoxy compound (A) having an isocyanuric acid ester construction or a cyanuric acid ester construction and at least one organic compound (B) capable of reacting with the epoxy group of said epoxy compound (A) and having one or more carboxyl, amino, isocyanate or hydroxyl groups or (2) a product of a melt reaction of said epoxy compound (A) with said organic compound (B), and then melt mixing and milling the blend. The polyester composition may comprise a fibrous filler and glass flakes, and has a high moldability and excellent physical properties.
摘要:
A polyolefin resin composition comprising a modified polyolefin prepared by reacting a polyolefin with an unsaturated carboxylic acid in the presence of a catalyst including at least one member selected from the group consisting of ketal peroxides and dialkyl peroxides having a decomposition temperature necessary for attaining the half life of 10 hours of at least 80.degree. C., and a fibrous, powdery, or flaky reinforcement.
摘要:
Disclosed are thermoplastic resins comprising block copolymers composed of polyester segments and vinyl polymer segments and having excellent thermal resistance and moldability, as well as several processes for preparing same. Among these thermoplastic resins, block copolymers formed of amorphous aromatic polyester segments and polystyrene resin segments are also useful as optical resins.
摘要:
A polyolefin resin composition comprising a polyolefin modified with an unsaturated carboxylic acid, at least one member selected from the group consisting of polyepoxides, polyisocyanates, and polyamines, and a reinforcement.
摘要:
A process for the production of polyester is disclosed, comprising feeding an ester compound made mainly of terephthalic acid and ethylene glycol or an oligomer thereof to a final polymerization reactor, and then polymerizing it in the form of fine molten particles in an inert gas stream, wherein the ester compound has an intrinsic viscosity [.eta.] of not more than 0.4 dl/g and a carboxyl terminal group concentration [COOH] of not more than 90.times.[.eta.].sup.-0.4 .mu.eq/g, and the fine particles have an average particle diameter of from 0.015 to 0.5 mm.