Abstract:
Curable compositions containing (A) one or more epoxy resins, one (B) or more curing agents and (C) one or more cure controlling catalysts wherein at least one of components (A) or (B) or both components (A) and (B) contain a mesogenic moiety are prepared. These curable compositions permit processing at higher temperatures and improved properties. They are useful in the preparation of coatings, castings, electrical or laminates or composites and the like.
Abstract:
4,4'-Dihydroxy-alpha-alkylstilbenes of high purity were prepared by reacting at a temperature of from -20 DEG C to 20 DEG C a mixture of: (1) at least one alpha-haloketone; (2) at least one phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound; and (3) at least one strong protonic acid or Lewis acid, such that the mole ratio of phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound: alpha-haloketone(s) is from 0.1:1 to 1.9:1, and the mole ratio of phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound: alpha-haloketone(s):strong protonic acid or Lewis acid is from 0.1:1:0.0026 to 1.9:1:0.95. The high purity 4,4'-dihydroxy-alpha-alkylstilbenes are useful for the advancement of epoxy resins, for the preparation of phenoxy resins and for the preparation of epoxy resins.
Abstract:
The present invention concerns bis(aminophenoxy)-alpha-substituted stilbenes represented by Formula (I) wherein each R is independently hydrogen or a hydrocarbyl or hydrocarbyloxy group having from one to about 10, preferably one to about 4, carbon atoms, a halogen atom, preferably chlorine, bromine or fluorine, a nitro group, a nitrile group or a -CO-R group; each R is independently hydrogen or a hydrocarbyl group having from one to about 10, preferably one to about 6, carbon atoms; X is a (a) or (b) group, each R is independently hydrogen or a hydrocarbyl group having from one to about 10, preferably one to about 2, carbon atoms; R is a hydrocarbyl group having from one to about 10, preferably one to about 2, carbon atoms and may be chlorine or a nitrile group, when n has a value of zero; and n has a value of zero or one. Bis(aminophenoxy)-alpha-substituted stilbenes are prepared by reacting a dihydroxy-alpha-substituted stilbene with a halonitrobenzene in the presence of a basic acting substance such as potassium carbonate and hydrogenating the resulting bis(nitrophenoxy)-alpha-substituted stilbene to convert the nitro groups to amino groups. These compounds are useful as curing agents for epoxy resins.
Abstract:
Polymer concrete compositions are made from norbornyl modified unsaturated polyesteramide compositions. The curable concrete composition contains 2 to 20 percent by weight of the polyesteramide composition and 98 to 80 percent by weight of an aggregate such as sand, gravel, silica flour, etc. The polyesteramide composition contains norbornyl modified polyesteramide, ethylenically unsaturated monomers, such as styrene with or without a vinyl reactive additive. The polyesteramide can be further modified to contain a copolymerized polyether polyol having a functionality of three or more, a copolymerized poly (2-alkyl-2-oxazoline) or a copolymerized carboxylated rubber. The vinyl reactive additive can be a vinyl ester resin or a vinyl terminated urethane oligomer. When cured, the curable concrete composition gives a polymer concrete with better tensile and compressive strength with the advantage that the composition cures under water and in the presence of moisture.
Abstract:
Thermoplastic hydroxy ether polymers containing inertly substituted or unsubstituted stillbene and ether linkages in the backbone chain and pendant hydroxyl moieties are prepared by reacting (a) an inertly substituted or unsubstituted dihydroxy-stillbene with (b) a diglycidyl ether and, optionally, (c) a difunctional monomer under conditions sufficient to cause the hydroxyl moieties to react with the epoxy moieties to form ether linkages and pendant hydroxyl moieties. The polymers exhibit excellent oxygen barrier properties and are useful in packaging oxygen-sensitive materials.
Abstract:
Described are methods for increasing the yield of processes for preparing 4,4'-dihydroxy-alpha-alkylstilbene or 4,4'-dihydroxy-alpha, alpha'-dialkylstilbene. These methods permit the recycle of an organic phase separated from the reaction mixture into the crystallization step of a separate batch of dehydrohalogenation reaction product, with the phenolic-starting materials present therein serving as a diluent.
Abstract:
Diamino-alpha-alkylstilbene compounds are prepared which compounds contain a mesogenic moiety. These compounds are useful as curing agents for epoxy resins.
Abstract:
Advanced epoxy resin compositions provide improvements in processability, filler acceptability and rheology through the employment of epoxy resins with reduced viscosity per unit epoxide equivalent weight. The compositions are useful as powder coatings on metallic substrates. The products are obtained through the polymerization in the presence of a polymerization catalyst of a monomer mixture containing at least one vinyl aromatic monomer such as styrene, an epoxide group - reactive functionality and polymerizable ethylenically unsaturated group - containing compound such as methacrylic acid, and optionally a hydroxyalkyl(meth)acrylate or alkyl(meth)acrylic such as hydroxyethyl acrylate. The monomer mixture is polymerized in the presence of a reaction product of a digllycidyl ether of a dihydric phenol such as bisphenol A and an epoxide group - reactive functionality and polymerizable ethylenically unsaturated group - containing compound such as methacrylic acid. The resulting polymerization product is advanced in the presence of an advancement catalyst with a dihydric phenol such as bisphenol A.
Abstract:
When cured, these resins have higher heat distortion temperature and/or higher elongation values than advanced epoxy resins which do not contain triazine groups or triazine and oxazoline groups.