Shell Oil Comapny

Roy J Jackson

Anthony M Pigneri

Larry S Corley

Walter V Breitigam

Ralph E Brown

Marlene Canahuati

New aromatic compounds containing at least one cyanate ester and at least one propargyl ether group, each independently directly attached to a ring carbon atom(s), are useful in the preparation of resins having a low dielectric constant.

Aromatic compounds containing cyanate ester and propargyl ether groups

A polymaleimide/epoxy blend is cured with cyanamide to provide interlocked one-phase networks with superior thermal properties.

Cyanamide-cured maleimide/epoxy resin blend

An epoxy resin composition containing an imidazole curing agent is useful in processes for lining the interior surfaces of buried pipes. The imidazole is non-substituted at the 1 position and is preferably alkyl-substituted at the 2 position, such as 2-propyl imidazole. Pipe-lining compositions using such imidazole-cured systems have long working lives, short cure times at moderate temperatures, low tendency to exotherm, insensitivity to moisture, and low creep and shrinkage, resulting in a pipe-lining system which can be used in a wide range of field conditions and produces a superior pipe liner.

Pipe rehabilitation using epoxy resin composition

A base-catalyzed process is provided for the preparation of cyanate esters, the process including the step of pre-reacting a phenolic starting material with the basic catalyst and then reacting the pre-reaction product with a cyanogen halide. The process permits the preparation of cyanate esters in high yields at reaction temperatures above room temperature.

Preparation of cyanate esters

New curable resin compositions comprise a (bis- or poly)-maleimide and a propargyl aromatic ether.

Curable resin compositions

New curable resin composition comprises a cyanate aromatic ester and a propargyl aromatic ether.

Curable resin from cyanate aromatic ester and propargyl aromatic ether

Alpha, alpha', alpha'-tris(4-cyanatophenyl)-1,3,5-triisopropylbenzenes are new and useful for preparing high heat resistant resins having a low dielectric constant, particularly for electrical applications.

Resin from alpha, alpha',

A process is disclosed for preparing an advanced epoxy resin by reacting a relatively low molecular weight polyepoxide with a phenol, thiophenol, carboxylic acid or carboxylic acid anhydride in the presence of a catalytic amount of an alkyl substituted phosphonium salt such as tributyl phosphonium bromide. The process can be carried out under reaction conditions, such as the presence of water, which are deleterious to certain epoxy advancement catalysts.

Epoxy fusion catalyst and process

According to the invention, a relatively low molecular weight epoxy resin is reacted with a hydroxyl group-containing compound in the presence of a bis(trihydrocarbyl phosphine)iminium salt catalyst to produce a high molecular weight fusion reaction product. The process is particularly useful in reacting an epoxy resin having a molecular weight of less than about 500 with bisphenol-A in the presence of a bis(phosphine)iminium halide to produce a fusion reaction product having a molecular weight within the range of about 500 to 7000. The catalyst is relatively water-insensitive, and the reaction can therefore be carried out in the presence of water.

Epoxy fusion process

The present invention provides a rapid, low-temperature curing epoxy resin adhesive composition comprising (1) a polyepoxide, (2) a catalytic amount of HBF.sub.4, (3) a finely divided filler, preferably an acidic filler, and, optionally, (4) a polyalkylene ether glycol.

Rapid curing epoxy resin adhesive composition

This invention relates to a flame retardant cured epoxy composition useful for electrical laminates comprising a brominated epoxy resin, aromatic amine and dicyandiamide.

Flame retardent epoxy resin composition

Stabilized polyester compositions comprise (1) an ethylenically unsaturated polyester prepared by esterifying a polyepoxide with an ethylenically unsaturated monocarboxylic acid (e.g., acrylic or methacrylic acid) in the presence of an organic phosphine catalyst (e.g., triphenylphosphine), (2) a primary or secondary amine (e.g., p,p'-dioctyldiphenylamine) and, optionally, (3) a compatible ethylenically unsaturated monomer (e.g., styrene).

Stabilized polyester compositions

The present invention provides stable vinyl ester compositions exhibiting improved color stability comprising a vinyl ester resin prepared by esterifying an epoxy compound with an ethylenically unsaturated monocarboxylic acid and a stabilizer composition comprising hydroquinone and a sterically hindered phenol.

Vinyl ester resins having improved color

The present invention provides an improved process for reducing the premature gelation during esterification of epoxy compounds containing tertiary, allylic or benzylic hydrogens (e.g., saturated epoxy resins) with ethylenically unsaturated monocarboxylic acids (e.g., acrylic acid) wherein the epoxy compound in pre-reacted with a trialkylphosphite (e.g., triethylphosphite) prior to the esterification.

Growing community of inventors

Houston, TX, United States of America

Roy J Jackson