Abstract: Ethylene-vinyl acetate copolymers having a melt index of 700 to 10000 and containing from 11 to 40% vinyl acetate are useful in hot melt systems and particularly in formulating low viscosity hot melt adhesives, preferably in binary compositions with natural or synthetic resin tackifiers. The adhesives show long open times with short setting times, and excellent adhesive properties.The EVAs are prepared by a high pressure polymerization, preferably by using chain transfer agent such as isobutylene to achieve high melt indices.

Abstract: A stabilized halobutyl rubber composition comprises (1) a halobutyl rubber e.g. chlorobutyl, (2) an alkali metal carboxylate or an alkaline earth metal carboxylate e.g. calcium stearate and (3) an ether, e.g. a polyether.With this stabilization system during the drying process in the halobutyl plant hydrogen halide evolution is strongly delayed and even if some hydrogen halide is evolved, usually no cross-linking occurs.

Abstract: This invention relates to a catalyst composition for polymerization of propylene, having high activity and producing polypropylene of high stereoregularity and having a low particle size distribution, which comprises;1. reducing TiCl.sub.4 by diethylaluminum chloride (DEAC), thereby forming a reduced solid (TiCl.sub.3),2. removing the aluminum compounds from the reduced catalyst,3. treating the said reduced solid with the mixture or complex of TiCl.sub.4 and diisoamylether (IAE) and4. separating the solid catalyst from the mixture.The aluminum compounds may be removed by washing with a complexing agent therefor; in a preferred embodiment the complexing agent is di-n-butyl ether.

Abstract: The invention relates to a method for preparing a catalyst composition for polymerization of propylene, having high activity and producing polypropylene of high stereoregularity in narrow particle size distribution, which comprises:1. reducing TiCl.sub.4 by a mixture of diethylaluminum chloride (DEAC) and ethylaluminum dichloride (EADC), thereby forming a reduced solid (TiCl.sub.3),2. removing the aluminum compound from the reduced solid;3. treating the said reduced solid with a mixture or complex of TiCl.sub.4 and diisoamylether (IAE), and4. separating the solid catalyst from the solution.Preferably step 2 is performed by washing with a complexing agent for the aluminum compound.

Abstract: In a process for producing elastomers of ethylene and C.sub.3 to C.sub.10 alpha-olefins, improved products, higher catalyst efficiency, improved monomer conversion and control of molecular weight distribution are obtained by the use of staged reactors wherein the monomer feed is divided between the reactors, the catalyst feed is added to the first reactor and the cocatalyst feed is divided with a different cocatalyst supplied to the second reactor. The process is applicable in either a divided single reactor or in the use of multiple reactors.

Abstract: The adhesive strength of a metallic layer prepared by vacuum metallizing on an unsaturated carboxylic acid modified polyolefin article is substantially increased by heating below the melting point of the polyolefin after the metallization. Preferable heating temperature is 92.degree.-157.degree. C. for polypropylene and heating time is 10 sec. - 1 hour. An aluminum layer obtained by this invention has remaining ratio of 100% after cross cut test.

Abstract: Synthetic polymer compositions such as polymers and copolymers of ethylene and an alpha-olefin having a tensile strength at yield of less than about 1500 psi, a hardness of less than about 40 units on the Shore D hardness scale, and a tensile strength at 300% elongation of between about 450 to 1200 psi are effective artificial roughage materials when fed to ruminant animals. These synthetic polymer compositions, when ingested by the ruminant, form a loose fibrous mass in the rumen of the animal which enhances rumination. Increasing the rumination results in increasing the consumption of the feed by the animal and thus results in increased production of the animal products.

Abstract: A multilayer composition may be prepared by a process comprising applying an intimately mixed blend of a thermoplastic polyolefin and an elastomer to the surface of an elastomer and bonding said blend to said surface by heating and application of pressure. Thus a film of the intimately mixed blend may be applied to the surface of the elastomer.Also a motor-car door seal can be produced by extruding to the desired profile the intimately mixed blend of thermoplastic polyolefin and elastomer so as to form the base foot and bonding the elastomer seal to the extruded section.

Abstract: Novel polyamides are prepared by reacting a dicarboxylic acid with 1,4-cyclohexane-bis(.beta.-ethylamine). Unique properties are obtained where the dicarboxylic acid is 1,4-cyclohexane diacetic acid. The polymers of this invention are distinguished from the prior art in that they exhibit unexpectedly high melting points and crystallinity. Thence they are suitable for use in fibers as well as molding and other general polyamide applications.

Abstract: Aluminum trialkyl and aluminum dialkyl monohalide catalysts can be used to graft cationically polymerizable monomers, such as styrene, chloroprene, isobutylene, etc. to halogenated polymers with some highly reactive halogen atoms such as PVC, neoprene, chlorobutyl, etc.

Abstract: Compositions suitable for fabricating into a self-sealing film comprise (i) 90-99.95 wt.% of a copolymer of ethylene and a vinyl (or hydrocarbyl substituted vinyl) ester of a C.sub.1 -C.sub.30 monocarboxylic acid, (ii) either 0.05 to 10 wt.% of a hydrocarbon resin, or 0.05 to 5 wt.% of polybutylene or polyisobutylene, or a combination of 0.05 to 10 wt.% of the hydrocarbon resin and 0.05 to 5 wt.% of polybutylene or polyisobutylene, provided the combined weight of the hydrocarbon resin and polybutylene or polyisobutylene is not more than 10 wt.% and (iii) 0.01 to 3.0% by weight based on the combined weight of (i) and (ii) of a partial carboxylic acid ester of a polyol, e.g. sorbitan monolaurate.