Abstract: A heat-curable and solvent-soluble ester group-containing polymer composition is prepared by the steps of:(1) either (i) reacting a highly polymerized linear aromatic polyester with a diaryl carbonate to depolymerize it to a solvent-soluble low-molecular-weight polyester (component A) containing terminal aryl carboxylate groups, or (ii) effecting the above depolymerization in the presence of a compound containing at least two specified functional groups thereby to form a modified solvent-soluble low-molecular-weight polyester (component A') containing terminal aryl carboxylate groups; and(2) either (i) mixing the resulting component A or A' with a monomeric or solvent-soluble polymeric, polyfunctional compound (component B) containing at least two hydroxyl and/or primary or secondary amino groups or (ii) partially reacting the resulting component A or A' with the component B. The composition has superior workability in molding and curing, and gives cured molded products of high utilitarian value.

Abstract: Films, 0.5-10 mils thick, which are rapidly and completely soluble in cold water, and which are suitable for use as packaging film in automatic packaging equipment, can be prepared by conventional melt extrusion processes when prepared from a novel composition consisting essentially of 5-20 parts by weight of a polyethylene glycol (having an average molecular weight in the range between 325 and 550) in 100 parts by weight of a partially hydrolyzed low molecular weight polyvinyl alcohol.

Abstract: Dry granular silicon acid, an organic polyol and a silicon tetrahalide are mixed simultaneously to produce an organic halosilicon acid resinous product.

Abstract: A powdery coating composition comprising (1) 10 to 40% by weight of a solid cross-linking agent having a softening point of 50.degree. to 120.degree. C. and prepared by heating 40 to 75% by weight of an acrylic resin having free hydroxyl groups and 60 to 25% by weight of an alkoxyaminotriazine at 50.degree. to 120.degree. C., and (2) 90 to 60% by weight of a base resin having a softening point of 60.degree. to 130.degree. C. and an acid value of up to 30 and containing 0.4 to 2.0 moles of free hydroxyl groups per kilogram of the resin, the alkoxyaminotriazine having 0 to 1 non-methylolated NH bond per triazine ring, at least 80% of the methylol groups of the alkoxyaminotriazine having been etherified with an aliphatic or alicyclic alcohol or ethylene glycol monoalkyl ether.