Shell Oil Comapny

Ronald S Bauer

Kailash C Dangayach

Larry S Corley

John A Lopez

Harold E De La Mare

Walter V Breitigam

Clayton A May

John W Jenkins

A process for preparing thermoset composite articles under relatively mild conditions includes exposing a laminate containing a partially-cured thermosettable resin and a fibrous substrate to an elevated temperature which increases over time, the elevated temperature being below the glass transition temperature of the resin but sufficient to promote further curing and increase the glass transition temperature thereof to the ultimate glass transition temperature of the resin. The temperature of exposure is generally increased at a rate which maintains the temperature within about 20.degree. C. below the glass transition temperature of the thermoset-table resin, so that cure of the resin proceeds in the glassy state. The pressure during the process is generally maintained below about 50 psi and is preferably atmospheric pressure. The process enables the production of thermoset composite articles suitable for high-performance applications without lengthy autoclave treatments.

Process for preparing thermoset composite articles

A polysiloxane-modified epoxy-based encapsulation composition comprising an epoxy resin, a curing agent for the epoxy resin, a polylactone-polysiloxane block copolymer, and a filler is described. The powder molding compositions provide a low internal stress epoxy composition without significantly sacrificing T.sub.g.

Polysiloxane modified thermoset compositions

A process is disclosed for preparing a low-chlorine tetrafunctional epoxy resin which employs crystallization of the epoxy resin from solution in a finishing step of the preparation process. The process involves (a) contacting, in a basic reaction medium, epichlorohydrin and a tetraphenol of ethane to produce a reaction product mixture containing a polyglycidyl ether of the tetraphenol of ethane; (b) dissolving the polyglycidyl ether in an organic solvent and, optionally, contacting the polyglycidyl ether with a dehydrochlorination agent; and (c) reducing the temperature of the organic solvent so as to effect crystallization of a low-chlorine fraction of the polyglycidyl ether.

Process for preparing low-chlorine epoxy resins

A process is disclosed for preparing a low-chlorine epoxy resin which employs crystallization of the epoxy from solution in a finishing step of the preparation process. The process involves (a) contacting, in a basic reaction medium, epichlorohydrin and a biphenol to produce a reaction product mixture containing a diglycidyl ether of the biphenol; (b) dissolving the diglycidyl ether in an organic solvent and, optionally, contacting the diglycidyl ether with a dehydrochlorination agent; and (c) reducing the temperature of the organic solvent so as to effect crystallization of a low-chlorine fraction of the diglycidyl ether.

Polysiloxane-polylactone block copolymer modified thermostat compositions

A composition is provided comprising an epoxy resin and an aromatic amine curing agent, the latter which can be described by the formula ##STR1## in which each R is selected C.sub.2 -C.sub.7 alkyl and each R' is selected from C.sub.1 -C.sub.7 alkyl. The described composition has good physical properties for high-performance composite applications and has a relatively long working life.

Curing agents for epoxy resins comprising diamines with the

The present invention is particularly directed to a coating composition exhibiting faster cure times and improved physical properties which comprise (1) from about 60% to about 95% by weight of a saturated epoxy resin, (2) from about 5% to about 40% by weight of triglycidyl cyanurate (or triglycidyl thiocyanurate) and (3) a curing amount of an epoxy curing agent, preferably an amino-containing curing agent.

Curable saturated polyepoxide-triglycidyl cyanurate compositions

Rapid-drying, one-package, epoxy traffic paint composition comprises (1) an adduct of an epoxy resin and a polymerized fatty acid, (2) a thermoplastic resin and (3) one or more pigments.

Epoxy resin traffic paint compositions

Stable, high-solids, low-temperature baking compositions are prepared by first reacting an epoxy resin with a polymeric fatty acid, and then reacting the resulting condensate with more than 2% by weight of a strong acid, and adding a curing amount of an amino-containing resin.

Low-temperature epoxy baking compositions

Ambient curable saturated epoxy resin compositions

The preparation of solid saturated epoxy resin compositions, which when cured with conventional epoxy curing agents yield coatings exhibiting improved weatherability, i.e., better gloss retention and better chalk resistance, are described. The solid saturated epoxy resins are prepared by reacting liquid or semisolid saturated epoxy resins with a dihydroxy phenol such as resorcinol in the presence of a suitable catalyst.

Saturated epoxy resin coating compositions exhibiting improved

The physical properties of heat-cured coatings of saturated epoxy resins are significantly improved by the addition of heat stabilizers (antioxidant) and/or actinic stabilizers.

Epoxy resin composition having improved physical properties

A process for the regeneration of a catalyst containing a metal of the group consisting of rhodium and ruthenium employed in the hydrogenation of an organic compound possessing at least one carbon-to-carbon bond unsaturation in the presence of a methylene dichloride solvent is taught whereby the catalyst is regenerated after deactivation by contacting the deactivated catalyst first with a hydrogen-containing gas then with an oxygen-containing gas and finally with a hydrogen-containing gas.

Growing community of inventors

Houston, TX, United States of America

Ronald S Bauer