摘要:
This invention relates to high molecular weight polyamide resin compositions which are uniquely stable under hydrolytic conditions. The polyamide resin compositions are produced by the condensation of a diamine with a sterically-hindered neo-acid derivative such as .alpha.,.alpha.,.alpha.',.alpha.'-tetramethyl-p-phenylenediacetic acid.
摘要:
The present invention provides a process for preparing phosphorus and halogen containing polymers useful as flame retardant additives in cellulose acetate or cellulose triacetate fibers or films. The phosphorus and halogen containing polymers may be prepared by reacting a halogenated derivative of bis-hydroxyethyl terephthalate with a halogen containing phosphorus monomer having the formula ##STR1## wherein R represents a radical selected from the group consisting of (a) alkyl, (b) bromoalkyl, (c) chloroalkyl, (d) alkylamido and (e) dialkylamido radicals, wherein the alkyl substituents of the foregoing may contain from 1 to 10 carbon atoms, (f) cyclohexyl, (g) phenyl, (h) benzyl, (i) tolyl, and (j) xylyl, and X represents a halogen atom (preferably chlorine or bromine). Cellulose acetate and cellulose triacetate fibers and films containing as little as two percent by weight of the polymeric flame retardant additives are rendered both non-burning and resistant to loss of the polymeric flame retardant additive during use.
摘要:
Curable compositions are provided by the interaction of bis(2-hydroxyethyl) tetrachloroterephthalate with acrylic acid derivatives to form flame retardant unsaturated esters of tetrachloroterephthalic acid.
摘要:
This invention provides an improved process for producing alkyl ethers of polygalactomannan gum by contacting polygalactomannan gum with alkyl halide in the presence of a metal hydroxide catalyst and a quaternary ammonium phase-transfer agent.
摘要:
This invention provides high temperature performance polyester resins which contain polyphenyl ether blocks as recurring structural units. The polyester resins are melt stable at temperatures up to about 400.degree. C.
摘要:
This invention provides high temperature performance polyurea resins which contain polyphenyl ether blocks as recurring structural units. The polyurea resins are melt stable at temperatures up to about 400.degree. C and higher.
摘要:
This invention relates to high molecular weight polyester resin compositions which are uniquely stable under hydrolytic conditions. The polyester resin compositions are produced by the condensation of a dihydric polyol with a sterically-hindered neo-acid derivative such as .alpha.,.alpha.,.alpha.',.alpha.'-tetramethyl-p-phenylenediacetic acid.
摘要:
An improved melt processable blend is provided comprised of a polymer selected from the group consisting of a polyolefin and a polyester and a low molecular weight liquid crystalline compound which is capable of forming an anisotropic melt phase at the melt processing temperature of the blend.
摘要:
A process for preparing hydroxy aromatic carboxylic acids, or the ester derivatives thereof, comprises carbonylating a hydroxy aromatic halide in the presence of a reactive alcohol solvent and a catalytic amount of a Group VIII metal catalyst. The process has particular applicability to the preparation of 6-hydroxy-2-naphthoic acid from 6-bromo-2-naphthol, which can be easily prepared from .beta.-naphthol, a readily available and inexpensive starting material.
摘要:
This invention provides novel quaternary ammonium ethers of polygalactomannan having a degree of substitution between about 0.01 and 3.0, and further provides a process for producing quaternary ammonium ethers of polygalactomannan gums by contacting solid polygalactomannan gum with a haloalkyl-substituted quaternary ammonium compound under alkaline conditions in an aqueous solution of water-miscible solvent.