摘要:
Disclosed is a process for the preparation of primarily closed cell rigid foams, useful for strengthening mechanical construction parts or for use as insulation material, containing urethane groups, or urethane and isocyanurate groups where the polyol component is a higher molecular weight polyester polyol, containing in bonded form units having one or more of the structures: ##STR1## or a mixture of said polyester polyol and known polyester polyols and/or polyether polyols.
摘要:
Disclosed are polyester polyols liquid at 25.degree. C., having an average functionality of from 2 to 3, a hydroxyl number of from 25 to 400, an acid number smaller than 10 and a viscosity at 25.degree. C. of from 200 to 10,000 mPas, which contain in bonded form units having at least one of the structures--O--CH.sub.2 --CH(CH.sub.3)--CH.sub.2 --CH.sub.2 --CH.sub.2 --O--,--O--CH.sub.2 --CH(C.sub.2 H.sub.5)--CH.sub.2 --CH.sub.2 --O--,--OC--CH(CH.sub.3)--CH.sub.2 --CH.sub.2 --CO--and--OC--CH(C.sub.2 H.sub.5)--CH.sub.2 --CO--which are prepared by the polycondensation or transesterification of 2-methyl-1,5-pentanediol, 2-ethyl-1,4-butanediol, 2-methyl-glutaric acid and/or 2-ethyl succinic acid or their derivatives, optionally while using other organic polycarboxylic acids and multivalent aliphatic alcohols and are useful for preparing non-cellular or cellular polyurethane plastics or polyurethane-polyurea plastics.
摘要:
The invention relates to a process for producing fiber-reinforced flat semifinished products based on a polyamide matrix, comprising the following steps: (a) saturation of textile structures with a mixture comprising molten lactam, catalyst, and optionally activator, (b) cooling of the saturated textile structures, and (c) finishing of the cooled textile structures to give the fiber-reinforced flat semifinished product. The invention further relates to a process for producing a component made of the fiber-reinforced flat semifinished product.
摘要:
Thermoplastic molding compositions comprisingA) from 10 to 99.99% by weight of at least one thermoplastic polyester, B) from 0.01 to 50% by weight of a hyperbranched polycarbonate having an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, Part 2), C) from 0 to 60% by weight of other additives, where the total of the percentages by weight of components A) to C) is 100%.
摘要翻译:热塑性模塑组合物,其包含A)10至99.99重量%的至少一种热塑性聚酯,B)0.01至50重量%的具有OH值为1至600mg KOH / g聚碳酸酯的超支化聚碳酸酯(至 DIN 53240,Part 2),C)0至60重量%的其它添加剂,其中组分A)至C)的重量百分比的总和为100%。
摘要:
The present invention relates to a method for producing fiber-reinforced composite materials, in which a multiplicity of continuous filaments or woven fabric is impregnated optionally together with reinforcing materials, comprising caprolactam and other starting materials for polyamide 6 or other starting materials for copolymers of caprolactam, passed through at temperatures of 70 to 100° C., and anionically polymerized at temperatures of 100 to 190° C., and optionally repolymerized at temperatures of 90 to 170° C.
摘要:
A process for producing an activated monomer composition comprising at least one lactam and/or lactone, one catalyst, and one activator permits storage of the resultant monomer composition, since this is stable with respect to polymerization. Said monomer composition is used inter alia in producing a polyamide molding via ring-opening, anionic polymerization.
摘要:
A liquid-impregnated shaped foam article consisting ofa) from 1 to 10% by volume of an open-cell foam based on an aminoplast andb) from 90 to 99% by volume of a component which is liquid at 25° C., such as aromatic or aliphatic hydrocarbons, alcohols, ketones, water or aqueous dispersions, and the uses thereof for transporting or metering liquids, for cleavage through freezing, for energy absorption of projectiles or as latent heat stores.
摘要:
Thermoplastic molding compositions comprisingA) from 10 to 99.99% by weight of at least one thermoplastic polyester, B) from 0.01 to 50% by weight of a hyperbranched polycarbonate having an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, Part 2), C) from 0 to 60% by weight of other additives, where the total of the percentages by weight of components A) to C) is 100%.
摘要翻译:热塑性模塑组合物,其包含A)10至99.99重量%的至少一种热塑性聚酯,B)0.01至50重量%的具有OH值为1至600mg KOH / g聚碳酸酯的超支化聚碳酸酯(至 DIN 53240,Part 2),C)0至60重量%的其它添加剂,其中组分A)至C)的重量百分比的总和为100%。
摘要:
In a process for producing self-releasing, compact or cellular moldings which comprise polyisocyanate polyaddition products and may contain reinforcing material by reacting a) organic and/or modified organic polyisocyanates with b) at least one compound containing at least two reactive hydrogen atoms and having a molecular weight of from 62 to 10,000 and, if desired, c) chain extenders and/or crosslinkers in the presence of d) internal mold release agents and in the presence of or absence of e) catalysts, f) blowing agents, g) reinforcing materials and h) auxiliaries in an open or closed mold, the internal mold release agents (d) used are diesters and/or monoesters of alkylsuccinic acids and/or diesters and/or monoesters of alkenylsuccinic acids.
摘要:
The invention relates to a process for the preparation of bead shaped, expandable polystyrene by the polymerization of styrene in an aqueous suspension in the presence of dimeric .alpha.-methylstyrene as a regulator and a C.sub.3 to C.sub.6 hydrocarbon as a blowing agent, whereby one first reports the content of saturated hydrocarbons, having a boiling point between 70.degree. and 170.degree. C., in the styrene and dimeric .alpha.-methylstyrene, and then enough saturated hydrocarbons, having a boiling point from 70.degree. to 170.degree. C., are added before, during or after the polymerization so that their total content in the suspension is from 0.1 to 0.8 weight percent, based on the styrene.