Method of curing unsaturated polymer resin

Patent · Thu Jun 18 04:00:00 EDT 1970

OSTI ID:4397500

Goto, K; Araki, K; Sasaki, T

An unsaturated polyester resin in contact with a vulcanized rubber is haadened by ionization radiation. The unsaturated polyester resin includes unsaturated dibasic acid such as maleic anhydride and phthalic anhydride, reaction products with dihydric alcohols such as ethylene glycol and propylene glycol, the compounds that can be obtained by dissolving into vinyl monomer such as styrene, vinyl acetate, and methacrylate, the compounds im which parts of unsaturated dibasic acid are substituted by dibasic acid of aliphatic or aromatic compounds, and dibasic acids denatured with compounds having conjugated double bonds. This process can be applied to forming reinforced plastic articles and resinous coatings and to processing vulcanized rubber articles. its surface, then it was irradiated under the room temperature and pressure and l mA at a rate of l0 mu rad. The resin could be removed from the cellophane and rubber sheet, and hardness of its contacted surface was the same as uncontacted surface. (JA) Unsaturated polyester resin is hardened by ionizing radiation after the addition of heterocyclic compounds containing nitrogen atoms. According to this process, particularly by the addition of the heterocyclic compound, the unsaturated polyester resin may be rapidly, easily, and perfectly hardened by the low dose of 3 to 4 Mrads. The stability of the resulting hardened resin is almost not changed and moreover, the hardening reaction may be stopped at a desirable stage. The following heterocyclic compounds are used at a concentration between 0.05 to 2.0% by weight: sixmembered compounds such as pyridine, pyrimidine, triazine, quinoline, phthalazine and pyridazine; five-membered compounds such as pyrroles, imidazole, triazole, and benzotriazole, wherein pyridine is preferable. It is convenient to irradiate the hardening system by, for example, alpha , BETA , gamma , x rays, electron beams, and heavy proton beams. In the examples, 70 parts of unsaturated polyester (acid value of 45), which is prepared by dehydration condensation of 98 g of maleic anhydride, 148 g of phthalic anhydride and 160 g of propylene glycol, is dissolved in 30 parts of styrene, and 0.1% by weight of pyridine is added to the resulting unsaturated polyester resin. Then the resin of about 200 mu thickness is placed on the surface of glass plate and a cellophane sheet of 30 mu thickness is covered thereon. The laminate is irradiated with electron beams (2 MeV, l mA) at a dose of 4 Mrads. It is easily hardened and the surface hardness is 2H of pencil hardness. (JA)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-29-009928
• OSTI ID: 4397500
• Report Number(s): JP 73556 -
• Country of Publication: Japan
• Language: Japanese

Related Subjects

*POLYESTERS-- RADIATION HARDENING
COATINGS
IONIZING RADIATIONS
IRRADIATION
IRRADIATION PROCEDURES
N40300* --Chemistry--Radiation Chemistry
N50340 --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Radiation Effects
RADIATION CHEMISTRY
RESINS
RUBBERS