Abstract: 1,1,1,2-Tetrafluoroethane is a good chain-transfer agent for the preparation of polymers of tetrafluoroethylene in aqueous colloidal dispersion.

Abstract: The present invention relates to a process for producing a resin useful in plastic lenses, to plastic lenses containing the resin and to a process for producing the lenses.

Abstract: The present invention relates to resin useful in preparing plastic lenses having a high refractive index comprising reacting an aliphatic polyisocyanate compounds having at least one sulfur atom with one or more of active hydrogen compounds selected from the group consisting of a polyol, a polythiol having sulfur atoms only in a mercapto groups, and a polythiol having at least one sulfur atom other than in the mercapto groups; lenses containing the above-mentioned resin; and a method for the preparation thereof characterized by adding an internal release agent to the mixture of the above-mentioned raw materials in casting lenses from the resin; and lenses obtained by this method.

Abstract: The present invention relates to a coating composition comprising 2-100 parts by weight of a fluororesin, 5-100 parts by weight of a silicone oil, and a solvent to 100 parts of a urethane prepolymer, said urethane prepolymer comprising a polyol, castor oil polyol, and a polyisocyanate, and said coating composition being suitable for use as a coating for rubber products such as weather strips for cars, glass weather strips, synthetic resin products, and others.

Abstract: Metabolically-acceptable, surgical adhesives are prepared from polyisocyanates having the structral formula: ##STR1## wherein R is a polyvalent aliphatic radical of about 1 to 10 carbon atoms or a polyvalent aromatic radical of 6 to about 24 carbon atoms;A is C, S or P;Z is O or S;Y is 1 when A is C or P, and 2 when A is S;n is 1 or 2;p is at least 1;q is 0 or 1, with the proviso that when A is carbon or sulfur, q is 0;r is 0 or 1, with the proviso that when A is carbon or sulfur, r is 0;X is a residue of an organic compound having active hydrogen-containing groups; andX' is a residue of an organic compound having at least 1 active hydrogen-containing group.

Abstract: A silicone rubber composition composed of a high-molecular diorganopolysiloxane, a reinforcing silica filler and an organic peroxide as a curing agent is further compounded with a fluorine-containing low-polymeric compound such as poly(chlorotrifluoroethylene) and perfluorinated polyether compound of the formula F--[--CF(CF.sub.3)--CF.sub.2 --O--].sub.v --O--CF.sub.2 --CF.sub.3, in which v is 2 to 100, as well as fluoroalkyl-substituted organopolysiloxanes. The silicone rubber composition can give a cured silicone rubber product having greatly improved resistance against dynamic fatigue as in repeated cycles of stretching and relaxation.

Abstract: The process for preparing polyurethanes by the reaction of a bicyclic amide acetal and a polyisocyanate in the presence of a plasticizer such as dioctyl phthalate and a polyurethane catalyst such as stannous octoate is described.

Abstract: Highly functional fluorinated polyisocyanates of the formula: ##STR1## wherein Z.sub.1 represents the functional group --O--CO--NH--R--NCO;Z.sub.2 represents the difunctional group --O--CO--NH--R--NH--CO--O--;R.sub.f is a radical derived from fluoropolyethers having a molecular weight between 500 and 7000;T represents a trivalent or tetravalent radical derived from a polyol;q is zero or 1; ands is 1 or 2.Also, varnishes containing said highly functional fluorinated polyisocyanates of formula (I).

Abstract: This invention relates to organosiloxane compositions which have application as protective coatings for soft substrates. The compositions of the invention include a substituent selected from each of the following classes of compositions: organo-alkoxysilanes; polyoxymethylenes; monocarboxylic organic acids; and optionally inorganic hydroxyacids. The coatings formed form these compositions have properties as adhesion promoters and are abrasion resistant.

Abstract: A two-stage system can provide a water-soluble releasing interface which permits a plurality of cycles of the mold between applications with such reaction-injection molding materials as reinforced urethane. The two-coat release system provides on the mold surface a base coat, including a polymer release agent with groups capable of bonding to the mold surface (e.g., a carboxy-terminated silicone) and a bonding or cross-linking agent (e.g., tetraisopropyltitanate), which reacts with and cross links the polymer and provides bonding with the mold surface and for soap-like materials, and a top coat, which is a water-soluble soap-like material (e.g., a water-soluble metallic salt of long-chain fatty acid). Such a system can be particularly adapted for use with urethane RIM materials.

Abstract: A method of preparing substituted acylbenzenes is disclosed. The method comprises reacting selected acylhalides or equivalents with a selected poly-substituted benzene in the presence of an acylating catalyst comprising a perfluoro sulfonic acid polymer.