摘要:
The process of making a catalyst for the polymerization of 2-pyrrolidone by contacting an alkali metal pyrrolidonate, a quaternary ammonium halide and carbon dioxide in a mol ratio of about 1:0.1-2:0.1-0.5. The alkali metal pyrrolidonate may be prepared by reacting an alkali metal hydroxide with 2-pyrrolidone. The polymerization of 2-pyrrolidone in the presence of this catalyst system produces poly-2-pyrrolidone of high molecular weight.
摘要:
Copolymers of 2-pyrrolidone and C.sub.7 -C.sub.12 lactams are provided in solid form, at relatively high rates and molecular weights by polymerization in the presence of alkaline catalysts and carbon dioxide, by the inclusion of an auxiliary catalyst and a copolymerization promoter comprising certain onium salts and N-acyl lactams, respectively.
摘要:
A novel chemical compound is disclosed, namely meta-isocyanatobenzylisocyanate (MIBI). MIBI can be used to form useful polyurethane materials, particularly polyurethane coating materials.
摘要:
2,5-DIHYDROFURANS AND MALEIC ANHYDRIDE ARE POLYMERIZED TO PREPARE COPOLYMERS, HAVING A DIHYDROFURAN TO ANHYDRIDE MOL RATIO OF FROM 1:2 TO 1:3, USEFUL AS EPOXY RESIN CURING AGENTS.
摘要:
Tetraols of the formula ##EQU1## wherein R is hydrogen or hydroxy; R' is hydrogen or hydroxy and differs from R; n is an integer from 1 to about 6; and m is an integer from 0 to 6, are prepared by epoxidation of select unsaturated diols to form 1,2- epoxides, followed by hydroxylation of the epoxides.
摘要:
The invention provides a composition of matter having oxygen scavenger capabilities. The composition comprises a blend of a first polymeric component comprising a polyolefin, the first polymeric component having been grafted with an unsaturated carboxylic anhydride or an unsaturated carboxylic acid, or combinations thereof, or with an epoxide; a second polymeric component having OH, SH or NHR.sup.2 groups where R.sup.2 is H, C.sub.1 -C.sub.3 alkyl, substituted C.sub.1 -C.sub.3 alkyl; and a metal salt capable of catalyzing the reaction between oxygen and the second polymeric component, the polyolefin being present in an amount sufficient so that the blend is non phase-separated. In the preferred composition maleic anhydride is the grafted material, the second polymeric component is MXD6 nylon and the metal is cobalt. A method of providing a homogeneous blend of a polyolefin with a second polymeric component having OH, SH or NHR.sup.2 groups is also set forth. Articles such as containers for foods and beverages utilizing such compositions and/or such method are provided.
摘要:
Disclosed are substantially non-crosslinked anhydride-modified, saturated ethylene polymers and a process for making them which comprises mixing together in the absence of solvent:(a) maleic anhydride;(b) a free radical initiator;(c) a saturated ethylene polymer; and(d) a polyamideat a temperature at which the saturated ethylene polymer and polyamide undergo deformation and are converted to a molten or fluid state.
摘要:
The process of making a catalyst for the polymerization of 2-pyrrolidone by contacting an alkali metal pyrrolidonate, a quaternary ammonium carboxylate and carbon dioxide.
摘要:
The thermal stability of hot melt adhesives comprising a polymer of glycolic acid is significantly improved by incorporating a minor amount of silica in the adhesive composition.
摘要:
Flexible glycolic acid terpolymers useful in the preparation of hot-melt adhesives are prepared by heating glycolic acid, its esters, its homopolymers or mixtures thereof with a dihydroxyalkane and a dibasic acid.