摘要:
The invention relates to a thermoreversible process for the preparation of a hydantoin comprisng(a) reacting an unsaturated polyester with a monofunctional amine to yield a poly(ester aspartate), and(b) reacting said poly(ester aspartate) with an isocyanate to produce a poly(ester urea), and(c) heating said poly(ester urea) to form a hydantoin compound.The process is useful for the preparation of coatings.
摘要:
The invention relates to mixtures of poly(arylene sulphides), glass fibres and maleamidic acids, which are remarkable for good mechanical properties and an increased melt viscosity of the matrix resin.
摘要:
This invention relates to thermoplastic, aromatic polycarbonates in which mesogenic compounds corresponding to the following formula ##STR1## are incorporated as chain terminating agents, to their preparation by the known processes for the preparation of polycarbonates, and to their use for the production of moulded articles for optical purposes.
摘要:
The invention relates to new, free-flowing polyamide molding compounds and blends, characterized in that they are prepared by mixing of polyamides known per se in the melt with low molecular weight, liquid-crystalline esters and/or ester amides corresponding to formula (I) and/or liquid-crystalline, oligomeric esters and/or ester amides corresponding to formula (II) and, optionally, other additives, at least one polymeric blending component being used as a further additive in the case of polyamide blends, and to the use of these liquid-crystalline (LC) additives I and/or II as flow promoters in polyamide molding compounds and blends and to a process for the production of the new polyamide molding compounds and blends. The invention also relates to the new oligomeric esters and/or ester amides corresponding to formula (II).
摘要:
This invention relates to polyamide moulding compounds with improved processibility; to a process for their preparation, to their use for the production of moulded parts, sheet products, fibres and composite materials and to the moulded parts, sheet products, fibres, semi-finished products, composite materials and other articles produced from these moulding compounds. The invention is characterized by the use of small quantities of special amides and/or ureas which impart significantly improved flowability to the moulding compounds.
摘要:
The new bisesters of unsaturated carboxylic acids corresponding to the following formula ##STR1## may be used in curable polyester resin mixtures which may in turn be used for the production of moldings. The curable mixtures obtainable from the new bisesters of unsaturated carboxylic acids show a higher glass transition temperature than normal polyester resins and, despite a higher crosslink density, show broader-mesh crosslinking.
摘要:
Polyether polyols are produced by acid-catalyzed polyaddition of alkylene oxides to starter compounds having active hydrogen atoms. Perfluoroalkylsulfonic acid salts of metals from Group IIIA of the Periodic Table of Elements (corresponding to the IUPAC Convention of 1970) are used as the catalyst. The polyaddition reaction is carried out at a temperature of from 40 to 200.degree. C. at normal pressure or pressures from 0 to 20 mbar (absolute). An inert organic solvent may optionally be included in the reaction mixture. Substantially all of the catalyst is removed from the polyether polyol-containing reaction mixture by lowering the temperature and/or by addition of a precipitating agent and/or by extraction with water. If desired, the recovered catalyst may be used in subsequent polyaddition reactions.
摘要:
The invention is directed to a process for preparing SRIM molded article. The process broadly requires the use of a fiber reinforcement mat which is placed inside the mold cavity, and then a polyurethane reaction system is injected into the mold. The system comprising a polyisocyanate and a blend of active hydrogen containing compounds requires aldimines as part of the blend of active hydrogen containing compounds.
摘要:
Modified polyester resins contain polyester blocks which have been obtained from dicarboxylic acids and dialcohols, groupings of the formulae ##STR1## where X=Z=a hydrocarbon radical having 1 to 20 C atoms and Y=a hydrocarbon radical having 2 to 25 C atoms, and if appropriate groupings originating from crosslinking agents. They can be used as base polymers for toners.
摘要翻译:改性聚酯树脂含有由二羧酸和二醇得到的聚酯嵌段,其中X = Z =具有1-20个碳原子的烃基,Y =具有2-25个C原子的烃基的式 以及来自交联剂的适当组合。 它们可用作调色剂的基础聚合物。
摘要:
The thermoplastic block copolymers according to the invention of optionally substituted vinyl or vinylidene polymer segments and segments of liquid crystalline polymers are suitable for use as compatibility improvers or dispersing agents in otherwise incompatible or poorly compatible thermoplastic polymer mixtures and may be used for the production of moulded articles, filaments, fibres and films.