摘要:
A process for separating solid cyclic oligomeric dihydric phenol carbonate from solid high molecular weight linear aromatic polycarbonate which comprises admixing an organic solvent with a composition comprising major quantities of solid high molecular weight linear aromatic polycarbonate and minor quantities of solid cyclic oligomeric dihydric phenol carbonate and separating the cyclic oligomeric dihydric phenol carbonate soluble in the organic solvent from the high molecular weight linear aromatic polycarbonate insoluble in the organic solvent, said organic solvent selected so that a very large fraction of the said solid cyclic oligomer is separated from a very large fraction of the said polycarbonate which remains as a solid in the organic solvent.
摘要:
A high molecular weight stabilizer compound formed as an ester of 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-benzene-propanoic acid, or structural variants thereof, to impart improved resistance to the effects of ultraviolet radiation to polycarbonate comprising polymers, a process for the preparation of said compound, and articles of manufacture comprising said compound.
摘要:
A composition comprising a randomly branched aromatic polycarbonate polymer wherein the branching agent 1,1,1-tris-(4-hydroxyphenol)ethane is present in the polymer in quantities ranging from about 0.28 to about 0.36 mole percent compound based on the percent of dihydric phenol present in the polymer.
摘要:
A polycarbonate resin, containing in the polymer chain at least one divalent moiety of the formula: ##STR1## wherein E is selected from the group consisting of alkylene containing from 1 to 15 carbon atoms, inclusive, and halogen-substituted alkylene containing from 1 to 15 carbon atoms, inclusive, a is an integer of 0 or 1 and R' is hydrogen or hydrocarbyl or halogen substituted hydrocarbyl amenable to beta elimination upon thermal degradation.
摘要:
Linear polyester are branched by transesterification with resins having repeating or recurring polymer chain units of the formula: ##STR1## wherein m, n and p are each independent integers of 0 or 1; R represents hydrocarbyl; and E represents alkylene containing from 1 to 15 carbon atoms, inclusive, halogen- substituted alkylene of 1 to 15 carbon atoms, inclusive, alkylene of 1 to 15 carbon atoms, inclusive, substituted with a --COOR group where R is as previously defined, or alkylene having 1 to 15 carbon atoms substituted with a monovalent group of the formula: ##STR2## wherein X represents one of hydrogen, hydrocarbyl or ##STR3## wherein R is as defined above; provided there is at least one moiety present, containing an R group.
摘要:
Thermoplastic copolyester-carbonate resins are described, having included in their polymer chains, a moiety of the formula: ##STR1## wherein a and b are each whole number integers of from 0 to 1; and the sum of a+b is 1.The resins are useful intermediates for branched or cross-linked molding compositions.
摘要:
A composition comprising at least one oligomer of the formula ##STR1## wherein X is selected from the group consisting of alkylene of two to twelve carbon atoms, inclusive, alkylidene of one to twelve carbon atoms, inclusive, cycloalkylene of four to twelve carbon atoms, inclusive, cycloalkylidene of four to twelve carbon atoms, inclusive, ##STR2## a is zero or 1; n is an integer of one to about fifteen;R is alkylene of two to eight carbon atoms, inclusive, or alkylidene of one to eight carbon atoms, inclusive;R.sup.1 and R.sup.2 are the same or different and are alkyl or one to four carbon atoms, inclusive or halo;b and c are the same or different and are an integer of zero to four; andR.sup.3 and R.sup.4 are the same or different and are alkyl of one to eight carbon atoms, inclusive, or phenyl; andd and e are individually integers of 0.1 or 2 with the proviso that d & e is at least one.
摘要:
A thermoplastic polyester-carbonate resin containing in the polymer chain, divalent moieties of the formula: ##STR1## wherein R represents aliphatic hydrocarbyl of from 1 to 9 carbon atoms, inclusive, halogen substituted aliphatic hydrocarbyl of 1 to 9 carbon atoms, inclusive, aralkyl of 7 to 10 carbon atoms, inclusive and halogen substituted aralkyl of 7 to 10 carbon atoms, inclusive; a and b are each whole number integers of from 0 to 1; and the sum of a+b is 1 and wherein there are sufficient linkages of formula I to lower the glass transition temperature of the polymer.
摘要:
A composition comprising an admixture of an aromatic polycarbonate and a flame retardant effective amount of a compound of the formula ##STR1## wherein M is an alkali or alkaline earth metal;R is alkyl, halo, nitro, trihalomethyl or cyano;m is an integer of one to about ten;n is an integer of zero, one, two, three or four; andp is an integer of two, three, four, five or six.
摘要:
Non-Newtonian flow characteristics are achieved by partially end-capping a polycarbonate with a sulfonated compound. The novel polymers are used in blow molding applications.