The Dow Chemical Company

Paul M Puckett

Robert E Hefner, Jr

Jimmy D Earls

Katherine S Clement

Marlin E Walters

Emmett L Tasset

W Frank Richey

Steven L Brewster

Douglas L Hunter

Warren D White

Paul L Wykowski

Mary N White

V Rao Durvasula

Bruce L Burton

Hong A Nguyen

Larry T Blankenship

Epoxy resins containing rodlike mesogenic moieties are prepared from phenolic hydroxyl containing compounds which contain such moieties.

Glycidyl ether compounds containing mesogenic moieties

An improved tackifier for making tackified substrates contains: (a) at least one epoxy resin, and (b) at least one curing agent for the epoxy resin, but (c) no catalytic amount of catalyst for the reaction between the epoxy resin and the curing agent. The tackified substrates are used to make composites by: (1) placing one or more of the tackified substrates in a mold; (2) injecting into the mold a matrix resin formulation which is chemically-similar to the tackifier, except that it contains a catalytic amount of catalyst for the reaction between the epoxy resin and the curing agent; and (3) curing the matrix resin formulation. The tackifiers are more storage-stable than similar tackifiers which contain catalyst, and the resulting composites have and/or retain physical properties better than composites made using tackifiers without curing agent.

Process for resin transfer molding and formulations useful to practice it

The diglycidyl ether of 4,4'-dihydroxy-.alpha.-methylstilbene is prepared.

Diglycidyl ether of 4,4'-dihydroxy-.alpha.-methylstilbene

Novel polycyanate and polycyanamide compositions containing one or more rodlike mesogenic moieties, when cured, result in products having improved properties.

Mesogenic polycyanates and thermosets thereof

Compositions comprising epoxy resins containing one or more rodlike mesogenic moieties per molecule are cured with polyamines containing one or more rodlike mesogenic moieties per molecule. These curable compositions can be oriented by the application of an electric field or magnetic field or drawing and/or shear flow prior to and/or during curing. The resultant cured products exhibit an improvement in one or more physical and/or mechanical and/or thermal properties as compared to a like epoxy resin system which does not contain any rodlike mesogenic moieties.

Curable mixtures of mesogenic epoxy resins and mesogenic polyamines and

Compounds having acidic protons and a molecular structure which can delocalize the electron density of the conjugate base (target compounds) are chlorinated by contacting such compounds with a perchloroalkane and aqueous base in the presence of a phase transfer catalyst which is an tetraalkylammonium hydroxide. Chlorinated products, preferably gem-dichloro compounds, are produced. The gem-dichloro compounds are useful for alkylation of aromatic compounds. For instance fluorene is chlorinated to form 9,9-dichlorofluorene which is reacted with such compounds as phenol or aniline to form such compounds as 9,9-bis(hydroxyphenyl)fluorene, 9,9-bis(aminophenyl)fluorene, or 9-aminophenyl-9-chlorofluorene.

Chlorination process, alkylation of products of said process and some

Phenoxy resins containing rodlike mesogenic moieties are prepared from phenolic hydroxyl containing compounds which contain such moieties.

Mesogenic epoxy compounds

Advanced epoxy resin compositions are prepared by reacting epoxy resins with active hydrogen-containing compounds which contain mesogenic moieties. Curable compositions containing these advanced epoxy resin compositions are useful in adhesives, coatings, laminates castings and the like.

Advanced epoxy resin compositions containing mesogenic moieties

Compositions comprising epoxy resins containing one or more rodlike mesogenic moieties per molecule are cured with curing agents which will normally cure epoxy resins. These curable compositions can be oriented by the application of an electric field, magnetic field drawing and/or shear flow prior to and/or during curing. The resultant cured products exhibit an improvement in one or more physical or mechanical properties as compared to a like epoxy resin system which does not contain any rodlike mesogenic moieties.

Curable compositions of mesogen-containing advanced epoxy resins and

Advanced epoxy resins containing mesogenic moieties are prepared from epoxy resins which contain such moieties.

Curable compositions are disclosed which contain (I) an advanced resin composition prepared by reacting epoxy resins with active hydrogen-containing compounds which contain mesogenic moieties and (II) a suitable curing agent.

Growing community of inventors

Lake Jackson, TX, United States of America

Paul M Puckett