摘要:
Described herein is a composition which contains bis(2,3-epoxycyclopentyl) ether, a specific group of hardeners and a specific group of thermoplastics. When cured, these compositions have improved tensile properties as compared to similar compositions which do not contain thermoplastics.
摘要:
This invention relates to low viscosity curable polyester resin compositions and a process for the preparation thereof, which compositions contain a mixture of (i) an unsaturated ester terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof and (ii) a polymerizable ethylenically unsaturated monomer which serves to crosslink the unsaturated ester to a thermoset product. Fiber reinforced thermoset articles can be produced from these low viscosity curable polyester resin compositions.
摘要:
This invention relates to low viscosity polyester compositions which are terminally modified with a reactive olefin such as dicyclopentadiene or other Diels-Alder adducts of cyclopentadiene with an olefinic or acetylenic hydrocarbon or alkylated derivative thereof, and a process for the preparation thereof. These low viscosity polyester compositions have utility in resin systems for moldings, coatings, sealants and adhesives, and as reactive diluents.
摘要:
Curable liquid compositions are described which comprise a thermosetting resin with an acid number of about 40 or greater and an initiator selected from peroxyketals, ketone peroxides, and alkyl hydroperoxides.
摘要:
Described herein is a molding composition comprising: ##STR1## wherein n is a number having an average value of about 1.5 to less than about 4, m is equal to the free valence of R less the average value of n, R is the hydroxyl-free residue of an organic polyol which contained from 2 to 4, inclusive, hydroxyl groups, OH, in formula (I), (b) maleic anhydride, (c) an epoxide containing two or more 1,2-epoxide radicals, (d) an ethylenically unsaturated monomer which forms a liquid homogeneous mixture with the half ester, maleic anhydride and epoxide, and (e) one or more reinforcing fibers having a melting point or a glass transition temperature above about 130.degree. C.
摘要:
This invention involves a curable molding composition comprising a mixture of (a) a polyester of the following formula: ##STR1## wherein n has an average value between about 1.5 and 2, m is 2-n, R is the hydroxyl-free residue of a predominantly hydroxyl terminated polyester having a molecular weight not exceeding about 1500 and obtained by the condensation of a diol selected from the class consisting of 1,2-propylene glycol, 1,3-butanediol, 2,2-dimethyl-1,3-propanediol, dipropylene glycol, diethylene glycol, 2,2-dimethyl-3-hydroxypropyl 2,2-dimethyl-3-hydroxypropionate, the ethylene and propylene oxide derivatives of 2,2-bis(4-hydroxyphenyl)propane, and mixtures thereof, and mixtures of ethylene glycol and said diols, with a dicarboxylic acid or anhydride selected from the class consisting of maleic and anhdride, fumaric acid, ortho-phthalic acid and anhydride, isophthalic acid, terephthalic acid, carbic acid and anhydride, and mixtures thereof, (b) maleic anhydride, (c) an ethylenically unsaturated monomer which forms a homogeneous mixture with and is copolymerizable with (a) and (b), and (d) one or more reinforcing fibers having a melting point or a glass transition temperature above about 130.degree. C.
摘要:
Polyarylates derived from a mixture of iso- and terephthalic acids and 4,4'-biphenol and bisphenol A were found to afford melt stable polyesters having good solvent and stress crack resistance.