摘要:
High molecular weight aromatic polycarbonates having molecular weights M.sub.w (weight average) of between about 10,000 and 200,000, which are based on diphenols and monofunctional chain stoppers, which correspond to the general formula ##STR1## in which Z denotes the radical of a diphenol,n denotes an integer from 20 to 400,E denotes ##STR2## m is 0 or 1 and R denotes a hydrogen atom or a C.sub.1 to C.sub.3 alkyl group, and in which between about 0.5 and 5 mol % of Z are radicals of aromatic dihydroxyketones. These polycarbonates share mechanical and thermal properties with known polycarbonates but in addition are suitable for crosslinking, for example in the presence of photoinitiators and optionally photo-reducing agents and under irradiation with UV light. When crosslinked they are resistant to organic solvents and insensitive to stress-cracking, and have particularly good flame-repellent properties when additionally incorporating flameproofing agents.
摘要:
The present invention is concerned with thermoplastic molding materials of high molecular weight, thermoplastic, aromatic polycarbonates based on aromatic dihydroxy compounds and containing from about 0.01 to 0.1% by weight of esters of saturated aliphatic carboxylic acids with 10 to 20 C atoms and 4-hydric to 6-hydric alcohols.
摘要:
The invention relates to a thermoplastic moulding composition comprising a thermoplastic aromatic polycarbonate based on an aromatic dihydroxy compound and containing 0.01 to 0.5% by weight of an ester of a saturated aliphatic carboxylic acid with 10 to 20 C atoms per molecule and an aromatic hydroxy compound with from 1 to 6 hydroxyl groups.
摘要:
Homo- and copolymers of monomers obtained by acylation of 2-[4-hydroxy(or amino)phenyl]-2-[5-(8-hydroxyquinolyl)]-propane with .alpha.,.beta.-monoolefinically unsaturated carboxylic acid halides or - anhydrides. As comonomers can be employed compounds containing one or more .alpha.,.beta.-olefinically unsaturated groups such as olefines, diolefines, acrylic acid derivatives, vinyl monomers. The polymers having molecular weights between 5000 - 500,000 can be prepared by radical or ionic chain mechanisms, in continuous or discontinuous processes. They may be used for removing metal ions from their solution, for complexing of interfering metallic impurities in thermoplastic or thermosetting resins or in form of their metal complexes as stabilizers for plastics.
摘要:
The present invention relates to a process for preparing unsaturated esters by azeo-tropically esterifyinga) monohydric or polyhydric alcohols orb) polyesters which contain at least two hydroxyl groups per molecule and are the reaction product of polyhydric alcohols with mono- or dibasis, saturated or aromatically unsaturated carboxylic acids,with ethylenically unsaturated carboxylic acids in the presence of an acid catalyst and subsequently reacting the acid catalyst and any unesterified carboxylic acid groups with ethylenically unsaturated monoepoxy compounds.
摘要:
The present invention relates to an aqueous coating composition containinga) an aqueous solution or dispersion of a polyol component containing at least one water-dilutable polyacrylate resin having hydroxyl groups and a molecular weight (M.sub.n) above 500,b) a polyisocyanate component which has a viscosity of 50 to 10,000 mPa.s at 23.degree. C. and is emulsified in component a), andc) 0.5 to 6% by weight, based on the weight of component a), of a water-soluble polyether polyol having a molecular weight of 300 to 1000,wherein the coating composition has an NCO/OH equivalent ratio of 0.5:1 to 5:1, based on the isocyanate groups of component b) and the alcoholic hydroxyl groups of components a) and c).
摘要:
The present invention relates to a process for the preparation of a composition containing an isocyanurate polyisocyanate dissolved in a solvent inert to isocyanate groups bya) reacting 2.5 to 7% of the isocyanate groups of a starting diisocyanate based on 2,4-diisocyanatotoluene or a mixture of 2,4-diisocyanatotoluene and 2,6-diisocyanatotoluene with a monohydric alcohol corresponding to the formula ##STR1## wherein R.sub.1 is an aliphatic or cycloaliphatic C.sub.6-18 hydrocarbon radical which may be olefinically unsaturated,R.sub.2 is hydrogen or a methyl group, andn is 0 or an integer from 1 to 3,b) adding a sufficient amount of an organic solvent which is inert to isocyanate groups to form a 30 to 70% solution of the urethanized diisocyanate either before, during or after step a),c) subsequently partially trimerizing the remaining isocyanate groups of said urethanized diisocyanate in the presence of a catalyst which accelerates the trimerization of isocyanate groups andd) terminating the trimerization reaction when the content of unreacted diisocyanotoluene is less than 0.5% by weight by the addition of a catalyst poison.The present invention also relates to the solutions of isocyanurate polyisocyanates obtained by this process.
摘要:
(Meth)acrylic acid esters can be prepared by acid-catalyzed reaction of (meth)acrylic acid with alcohols in a water-immiscible solvent. After the esterification, the reaction mixture is washed with aqueous solutions having an alkaline reaction and then reacted at elevated temperature with carbodiimides. Acid numbers below 0.5 (mg of KOH/g of substance) are obtained in this way. (Meth)acrylic acid esters are used, for example, as reactive diluents or as comonomers.
摘要:
A process for the preparation of polycarbonates from diphenols and/or chlorocarbonic acid esters thereof and phosgene by the two-phase boundary process wherein said polycarbonate is reacted with aryl chlorocarbonate is disclosed; the reaction products are noted for their improved ageing and hydrolysis characteristics which render them useful as thermoplastic molding compositions.
摘要:
The present invention relates to a process for the preparation of aromatic polycarbonates from diphenols by the phase boundary process, which is characterized in that cyclic, preferably monocyclic or bicyclic, aza compounds are used as catalysts. The present invention also relates to the polycarbonates obtainable according to the process, which are distinguished by high light transmission and a low tendency to yellowing, even after relatively severe exposure to heat.