摘要:
This invention concerns optically brightened polyester materials and, in particular, formed polyester articles such as fibers containing certain 2,5-bis(p-carboalkoxystyryl)oxadiazole compounds such as 2,5-bis(4'-carbomethoxystyryl)-1,3,4-oxadiazole. These compounds impart exceptional brightness to the polyester and themselves have good fastness and stability properties.
摘要:
Compositions comprising a photocurable ethylenically unsaturated compound and an S-aryl arylcarbothioic acid ester or a bis-S-aryl aryl-dicarbothioic acid ester.
摘要:
This invention relates to 3,4-bis(halomethyl) benzophenone photoinitiators and these initiators admixed with unsaturated photopolymerizable compounds. When such compositions are irradiated by ultraviolet light, the benzophenone derivatives split off free radicals which initiate the photopolymerization of the unsaturated photopolymerizable compounds.
摘要:
This invention relates to 3,4-bis(halomethyl) benzophenone photoinitiators and these initiators admixed with unsaturated photopolymerizable compounds. When such compositions are irradiated by ultraviolet light, the benzophenone derivatives split off free radicals which initiate the photopolymerization of the unsaturated photopolymerizable compounds.
摘要:
The invention relates to photopolymerizable polymeric compositions useful as coating and moldable compositions which are hardenable by ultraviolet radiation. These coating and moldable compositions comprise mixtures of photopolymerizable or photocrosslinkable unsaturated compounds and at least one photoinitiator selected from the group consisting of halogenated heterocyclic compounds having at least one diazole or triazole group and at least one benzyl halide group.
摘要:
This invention relates to a process for the preparation of 5,5-bis(halomethyl)-1,3,2-dioxa-phosphorinanes from a dihaloneopentyl glycol and a phosphorous oxyhalide in the presence of a hydrogen chloride accepting reagent. These compounds are useful as flame retardants for polyesters.
摘要:
Disclosed is a process for the preparation of 4,4'-stilbenedicarboxylate esters by a 3-step process utilizing p-toluic acid, an alkyl p-formylbenzoate and a trialkyl phosphite. The steps comprise(1) preparing p-(chloromethyl)benzoic acid by chlorinating p-toluic acid with sulfuryl chloride in the presence of a free radical initiator and chlorobenzene or dichlorobenzene;(2) contacting the p-(chloromethyl)benzoic acid of step (1) with a trialkyl phosphite to obtain a phosphonate compound; and(3) contacting the phosphonate ester compound of step (2) with an alkyl p-formylbenzoate in the presence of an alkali metal alkoxide and an inert solvent to obtain the dialkyl 4,4'-stilbenedicarboxylate.
摘要:
Disclosed are a class of phenolic-hydrazide compounds of diverse structure which are useful as stabilizers for polyolefins. The phenolic-hydrazide compounds inhibit oxidative degradation of polyolefins which is attributable to heat and/or ultraviolet light and is promoted or accelerated by metals, e.g., copper, in contact with the polyolefin.
摘要:
Disclosed are novel cyclic phosphite compounds having the formula ##STR1## wherein each R.sup.1 is independently selected from hydrogen, alkyl, aralkyl, aryl, carboxy, alkoxycarbonyl or halogen;each R.sup.2 is independently selected from hydrogen, alkyl, aralkyl, alkoxy, aryl, carboxy, alkoxycarbonyl or halogen;R.sup.3 is (a) hydrogen, alkyl, cyclohexyl or aryl when n is 1; (b) alkylene, cyclohexylene, cyclohexylenedialkylene, arylene or a divalent group having the formula ##STR2## wherein R.sup.1 and R.sup.2 are defined above and A.sup.2 is 1,3- or 1,4-phenylene when n is 2; (c) alkanetriyl when n is 3; or alkanetetrayl when n is 4;n is 1, 2, 3 or 4; andA.sup.1 is 1,3-phenylene.Also disclosed are synthetic polymeric materials stabilized with one of the above compounds and phosphite chloride compounds from which the above compounds are prepared.
摘要:
Compositions comprising polyester or polycarbonate having reacted therein a total of from about 1.0 to about 5,000 parts by weight per million parts by weight of polyester of at least one UV absorbing compound of the formula ##STR1## wherein R is alkyl or the like, X is carbonyl or sulfonyl, R.sup.1 is hydrogen or a substituent, and Y and Z are hydrogen or substituents such as cyano or alkoxycarbonyl, with the provision that at least one of R, R.sup.1, Y, and Z is, or forms part of, or contains one or more reactive groups capable of undergoing a condensation reaction under polyester forming conditions, such that the UV absorbing compound is reacted into the polymer. The compound has a maximum light absorbance within the range of from about 320 nm to about 380 nm, which is nonextractable from the polyester and stable under the polyester processing conditions, for imparting UV screening properties to the polymer. Many products such as fruit juices, soft drinks, wines, food products, cosmetics and shampoos are deleteriously affected by UV light when packaged in clear plastic containers which pass significant portions of the available light at any wavelength from approximately 250 to 390 nm. By use of the present compounds polymeric containers can be manufactured which absorb these harmful wavelengths and therefore reduce or eliminate the UV light degradation of products packaged therein. A further advantage of the present polymeric compositions is that conventional polyester dyes and other additives such as pigments, fillers, brighteners and the like may be incorporated therein, and the UV screening properties of the methine compounds impart significant stabilization to both the polyester and the dyes.