摘要:
Linear aromatic polyesters are produced by the melt polymerization process by mixing a bisphenol, a diaryl ester of a dicarboxylic acid and an oligomeric polyester comprised of an aliphatic glycol and a dicarboxylic acid and reacting the mixture in the presence of a transesterification catalyst.
摘要:
An aromatic polyester of an aromatic dicarboxylic acid and halogenated bisphenol having a glass transition point above about 175.degree. C is employed as a non-blooming fire retardant additive for polymer compositions.
摘要:
This invention relates to imparting gray, blue, or purple tints to aromatic copolyester compounds. This is accomplished through the addition of a cobalt-containing compound such as cobalt carbonate, cobalt acetate, cobalt benzoate, or cobalt phenate to the polyester forming reaction system.
摘要:
Disclosed is a method of making an imide-containing polymer by bulk or melt polymerizing monomers. A mixture is formed of (1) a cyclic compound that contains an anhydride group and a second group which is an anhydride, a carboxylic acid, or an ester and (2) a diamine in an amount stoichiometric .+-.5 mole % of stoichiometric with the amount of cyclic compound. An end capper may also be included in the mixture to control the molecular weight but no solvent is used. A polyimidesiloxane can be made by using a siloxane-containing diamine. The mixture is heated to a temperature above the T.sub.g or T.sub.m of the polymer but below its degradation temperature.
摘要:
An aromatic polyester composition comprising an aromatic polyester derived from terephthalic acid and/or isothalic acid and a bisphenol and a stabilizer chosen from P-containing organic esters, O, S, or F-containing organic compounds or their mixtures.
摘要:
This invention relates to substantially transparent solid solution polymer blends having improved hydrolytic stability, and flexibility which comprise, in admixture, (1) a linear aromatic polyester of a dicarboxylic acid and a bisphenol, and (2) a linear aromatic polysulfonate of a bisphenol and a disulfonic acid. The polyblends are useful in preparation of films and molded articles.
摘要:
An aromatic polyester composition comprising an aromatic polyester derived from terephthalic acid and/or isophthalic acid and a bisphenol and a stabilizer comprising mercaptobenzothiazole.
摘要:
An aromatic polyester composition comprising an aromatic polyester derived from terephthalic acid and/or isophthalic acid and a bisphenol and a stabilizer comprising dimercaptothiadiazole.
摘要:
There are described linear aromatic polyesters of a bisphenol and a dicarboxylic acid having terminal carboxylate ester substituents of an aliphatic monofunctional alcohol of 8 to 45 carbons. The polyesters have enhanced hydrolytic stability compared to conventional polyesters of bisphenol and a dicarboxylic acid. Low molecular weight polyesters of the invention have improved stability on processing compared to comparable conventional polyesters of a bisphenol and a dicarboxylic acid. Processes for preparing the polyesters are also disclosed.
摘要:
Disclosed is a polyimidesiloxane adhesive made by reacting in a solution of an organic solvent a dianhydride selected from the group consisting of biphenyl dianhydride and oxydiphthalic anhydride with an approximately stoichiometric amount of a diamine. The diamine is a mixture of about 5 to about 30 mole % of a siloxane-containing diamine and about 70 to about 95 mole % of a non-siloxane containing diamine. The non-siloxane containing diamine is a mixture of about 10 to about 90 mole % each of at least two of the diamines 2,2-bis(4[4-aminophenoxy]phenyl) propane, &agr;,&agr;′-bis(4-aminophenyl)-1,4-diisopropylbenzene, 3,3′-diaminophenylsulfone, and 1,3-bis(3-aminophenoxy)benzene. The adhesive can be made into one, two, and three-layer tapes (or dispensed in other ways) which have a high Tg and a relatively low bonding temperature.