Patent EP0436153A2 successfully refreshed from Google Patents.
EP0436153A2
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Mold release agent
Assignee: Zeon Corp
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Filing: 1990-12-11
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Granted: —
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Expires: 2010-12-11
Abstract
Abstract A polyvinyl alcohol precoated mold provides a reactive injection molding (RIM) process without any sticky adhesion on the mold surface or product produced. According to the method of the present invention, the products so obtained have acceptable hardened surfaces and a smooth surface appearance. The molded product has no adherent polymerization residues on its surface providing for improved adhesion of subsequently applied coatings.
Inventors
- 👤 Tomoo Sugawara
- 👤 Kin-Ichi Okumura
- 👤 Motoyuki Yamato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:55
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C67/00; B29C67/24; B29C67/246; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
82 words
A process for the ring-opening bulk polymerization of a norbornene monomer(s) in a mold to form a molded product comprising providing a mold having a mold cavity; coating the surface of said mold cavity with a mold-release agent comprising a polyvinyl alcohol; optionally curing said mold release agent; conveying at least one norbornene monomer into said mold cavity; polymerizing said monomer(s) in the presence of a metathesis catalyst system to form a molded product; and removing said molded product from said mold.
Claim 2
Dependent Claim
21 words
The process of claim 1 wherein said polyvinyl alcohol has a degree of saponification of more than about 90 mole percent.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said polyvinyl alcohol has a degree of saponification of more than about 95 mole percent.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said curing step comprises thermally treating said coated mold until an adherent film is formed.
Claim 5
Dependent Claim
17 words
The process of claim 4 wherein said thermal treatment is conducted at about 140 to about 200°C.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said polyvinyl alcohol has an average degree of polymerization of more than about 200.
Claim 7
Dependent Claim
21 words
The process of claim 6 wherein said polyvinyl alcohol has an average degree of polymerization of about 300 to about 10,000.
Claim 8
Dependent Claim
20 words
The process of claim 2 wherein said mold release agent further comprises a metal particulate and, optionally, an inorganic filler.
Claim 9
Dependent Claim
59 words
The process of claim 8 wherein said metal particulate is selected from the group consisting of aluminum, steel, copper, zinc, tin, silver, iron, nickel, titanium, and mixtures thereof, and said inorganic filler, if present, is selected from the group consisting of calcium carbonate, titanium oxide, silica, alumina, aluminosilicate, aluminum hydroxide, talc, carbon black, milled glass, mica, and mixtures thereof.
Claim 10
Dependent Claim
52 words
The process of claim 8 wherein said mold release agent comprises about 1 to about 200 parts by weight of metal powder per 100 parts by weight of polyvinyl alcohol and, if present, about 1 to about 200 parts by weight of inorganic filler per 100 parts by weight of polyvinyl alcohol.
Claim 11
Dependent Claim
24 words
The process of claim 8 wherein said mold release agent is cured on said mold by thermal treatment at about 140 to about 200°C.
Claim 12
Dependent Claim
69 words
The process of claim 8 wherein said mold release agent further comprises an precondensate selected from the group consisting of urea resins, melamine resins, phenolic resins, and mixtures thereof in the amount of about 1 to about 20 parts by weight per 100 parts by weight of said polyvinyl alcohol; and said mold release agent is cured on said mold by thermal treatment at about 140 to about 200°C.
Claim 13
Dependent Claim
42 words
The process of claim 8 wherein said mold release agent comprises about 3 to about 100 parts by weight of metal particulate and about 3 to about 100 parts by weight of inorganic filler per 100 parts by weight of polyvinyl alcohol.
Claim 14
Dependent Claim
11 words
The process of claim 1 wherein a non-metallic mold is used.
Claim 15
Dependent Claim
28 words
The process of claim 1 wherein said monomer is selected from the group consisting of bicyclic monomers, tricyclic monomers, tetracyclic monomers, pentacyclic monomers, heptacyclic monomers, and mixtures thereof.
Claim 16
Dependent Claim
31 words
The process of claim 15 wherein said monomer is selected from the group consisting of norbornene, norbornadiene, dicyclopentadiene, dihydrodicyclopentadiene, tetracyclododecene, tricyclopentadiene, tetracyclopentadiene, including the alkyl alkenyl, alkylidenyl and aryl substituents thereof.
Claim 17
Dependent Claim
34 words
The process of claim 1 wherein said metathesis catalyst system comprises a catalyst selected from the group consisting of the oxides, halides, oxyhalides, and organoammonium salts of tungsten, molybdenum and tantalum, and mixtures thereof.
Claim 18
Dependent Claim
34 words
A mold release agent for the ring-opening bulk polymerization of a norbornene monomer(s) in a mold comprising a polyvinyl alcohol having a degree of saponification of more than bout 90 mole percent or more.
Claim 19
Dependent Claim
17 words
The mold release agent of claim 18 further comprising a metal powder and, optionally, an inorganic filler.
Claim 20
Dependent Claim
50 words
The mold release agent of claim 19 further comprising an precondensate selected from the group consisting of urea resins, melamine resins, phenolic resins, and mixtures thereof; which is present in the amount of about 1 to about 20 parts by weight per 100 parts by weight of said polyvinyl alcohol.
Claim 21
Dependent Claim
21 words
The mold release agent of claim 18 wherein said polyvinyl alcohol has a degree of saponification of 95 percent or more.
Claim 22
Dependent Claim
22 words
The mold release agent of claim 18 wherein the polyvinyl alcohol has an average degree of polymerization of more than about 200.
Claim 23
Dependent Claim
61 words
The mold release agent of claim 19 wherein said metal particulate is selected from the group consisting of aluminum, steel, copper, zinc, tin, silver, iron, nickel, titanium, and mixtures thereof, and said inorganic filler, if present, is selected from the group consisting of calcium carbonate, titanium oxide, silica, alumina, aluminosilicate, aluminum hydroxide, talc, carbon black, milled glass, mica, and mixtures thereof.
Claim 24
Dependent Claim
54 words
The mold release agent of claim 23 wherein said mold release agent comprises about 1 to about 200 parts by weight of metal particulate per 100 parts by weight of polyvinyl alcohol and, if present, about 1 to about 200 parts by weight of inorganic filler per 100 parts by weight of polyvinyl alcohol.
References Cited (Backward Citations)
No citation records indexed.
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