EP0106545A1
Expired / Lapsed
EP
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Reaction injection molding method
Assignee: Ube Corp
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Filing: 1983-09-16
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Granted: —
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Expires: 2003-09-16
Abstract
Abstract @ A molded article is formed by a reaction injection molding method wherein a starting material, e.g., an ω-lactam, is injected into a mold the inner pressure of which is maintained at 0.5 to 20 kg/cm 2 ·G with an inert gas; and the inner pressure of the mold is maintained at a level higher than the pressure increased by injection of the starting material until the polymerization molding of the starting material is completed.
Inventors
- 👤 Masao Hirakatajushi-Kenkyusho Nishiyama
- 👤 Keiichiro Hirakatajushi-Kenkyusho Katada
- 👤 Yoshiteru Hirakatajushi-Kenkyusho Akimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
B; B29; B29C; B29C45/00; B29C67/00; B29C67/24; B29C67/246; B29C37/00; B29C37/006; B29K; B29K2077/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A method for forming a molded article by reaction injection molding, which comprises injecting a starting material into a mold, the inner pressure in which is maintained 0.5 to 20 kg/cm 2· G with an inert gas and maintaining the inner pressure in the mold at a level higher than the pressure increased by injection of the starting material until the polymerization molding of the starting material is completed.
Claim 2
Independent Claim
69 words
A method for forming a molded article by reaction injection molding, which comprises injecting a starting material into a mold, the inner pressure in which is maintained 0.5 to 20 kg/cm 2· G with an inert gas and maintaining the inner pressure in the mold at a level higher than the pressure increased by injection of the starting material until the polymerization molding of the starting material is completed.
Claim 3
Dependent Claim
29 words
A method according to claim 1 wherein the inner pressure in the mold into which the starting material is injected is maintained at 1 to 10 kg/cm 2 .
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein the starting material comprises an w-lactam.
Claim 5
Dependent Claim
96 words
A method according to claim 1 wherein the starting material is a mixture of an w-lacctam, 0.05 to 10% by mole, based on the w-lactam, of an alkali catalyst and 0.01 to 5% by mole, based on the w-lactam, of a cocatalyst selected from the group consisting of N-acyl lactams, organic isocyanates, acid chloride, acid anhydrides, esters, urea derivatives, carbodiimides and ketenes, or 1 to 60% by weight, based on the w-lactam, of a cocatalyst selected from the group consisting of reaction produts of the above-listed cocatalysts with a polyol, a polyamine or a polycarboxylic acid.
Claim 6
Dependent Claim
38 words
A method according to claim 3 therein the polymerization molding of the w-lactam is carried out at a temperature not lower than the melting point of the w-lactam but lower than the melting point of the formed polyamide.
Claim 7
Dependent Claim
29 words
A method according to claim 1 wherein the level of the inner pressure in the mold maintained during the polymerization molding is not higher than 50 kg/cm 2 ·G.
References Cited (Backward Citations)
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