EP0453307A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Photocurable self-retainable gel, shaped article prepared therefrom, applications and preparations thereof
Assignee: WR Grace and Co Conn
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Filing: 1991-04-19
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Granted: —
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Expires: 2011-04-19
Abstract
Abstract A photocurable gel suitable for articles such as printing plates, photoresists and the like is disclosed. The photocurable gel comprises (a) a polymer composition having isotactic polymethyl methacrylate moiety; and syndiotactic polymethyl methacrylate moiety; (b) a photopolymerizable ethylenically unsaturated compound; and (c) a photopolymerization initiator. The gel is solid at ambient temperature and is capable of undergoing reversible gel/sol transition by heating or cooling. Methods of preparing articles, as well as methods of fixing articles, which use the gel are also disclosed. Such methods include sealing or affixing component parts on an electronic circuit board.
Inventors
- 👤 Yoshichi Hagiwara
- 👤 Hiroshi Samukawa
- 👤 Yuichi Kanazawa Bunko Mori
- 👤 Kazuhide Saigo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/033; H; H05; H05K; H05K3/00; H05K3/0073; H05K3/0076; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/111
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
52 words
A photocurable, self-retainable gel which is solid at ambient temperature and is capable of undergoing reversible gel/sol transition by heating or cooling, which gel comprises: a) a polymer composition comprising an isotactic polymethyl methacrylate moiety and a syndiotactic polymethyl methacrylate moiety, b) a photopolymerizable ethylenically unsaturated compound; and c) a photopolymerisation initiator.
Claim 2
Dependent Claim
29 words
A gel according to claim 1, wherein the total amount of polymer composition (a) is from 3 to 70% by weight based on the total weight of the gel.
Claim 3
Dependent Claim
32 words
A gel according to claim 1 or 2, wherein the amount of photopolymerisable ethylenically unsaturated compound (b) is from 10 to 97% by weight based on the total weight of the gel.
Claim 4
Dependent Claim
31 words
A gel according to claim 1, 2 or 3, wherein the amount of photopolymerization initiator (c) is from 0.01 to 10% by weight based on the total weight of the gel.
Claim 5
Dependent Claim
27 words
A gel according to any one of the preceding claims further comprising (d) an epoxy compound having at least two epoxy groups and (e) an epoxy hardener.
Claim 6
Dependent Claim
33 words
A gel according to claim 5, wherein the total amount of epoxy compound (d) and epoxy hardener (e) is from 5 to 85% by weight based on the total weight of the gel.
Claim 7
Dependent Claim
17 words
A gel according to any one of the preceding claims further comprising (f) an oil gelation agent.
Claim 8
Dependent Claim
28 words
A gel according to claim 7, wherein the amount of oil gelation agent is from 0.1 to 20% by weight based on the total weight of the gel.
Claim 9
Dependent Claim
16 words
A gel according to any one of the preceding claims further comprising a polymerisation inhibitor (g).
Claim 10
Dependent Claim
27 words
A gel according to claim 9, wherein the amount of polymerisation inhibitor is from 0.001 to 5% by weight based on the total weight of the gel.
Claim 11
Dependent Claim
29 words
A gel according to any one of the preceding claims wherein the polymer composition (a) comprises a copolymer of methyl methacrylate and a monomeric compound copolymerisable with methyl methacrylate.
Claim 12
Dependent Claim
15 words
A gel according to claim 11 wherein the copolymer is a block polymethyl methacrylate copolymer.
Claim 13
Independent Claim
61 words
A method of producing an article, which comprises: (i) exposing a gel as claimed in any one of claims 1 to 12 to actinic light through an image-bearing transparency whereby portions of the gel are cured; (ii) melting the uncured portions of the gel at a temperature above the flow temperature of the gel, and (iii) removing the melted uncured portions.
Claim 14
Dependent Claim
15 words
A method according to claim 13 for producing a relief printing plate or a photoresist.
Claim 15
Independent Claim
73 words
A method for processing an article, which comprises: (i) providing on the article a sol obtainable by melting a gel as claimed in any one of claims 1 to 12 at a temperature above the flow temperature of the gel; (ii) cooling the sol to a temperature below the flow temperature of the gel to reconvert the sol to a gel; and (iii) before or after (ii), exposing the gel to actinic light.
Claim 16
Independent Claim
82 words
A method for processing an article, which comprises: (i) exposing to actinic light a portion of a gel, as claimed in any one of claims 1 to 12, having a larger surface area than the surface area of the article; (ii) melting the uncured portion of the gel at a temperature above the flow temperature of the gel; (iii) placing the article in the melted uncured portion of the gel; and (iv) exposing the uncured portion of the gel to actinic light.
Claim 17
Dependent Claim
30 words
A method according to claim 16 which comprises cooling the melted, uncured portion of the gel to a temperature below the flow temperature of the gel prior step to (iv).
Claim 18
Dependent Claim
25 words
A method according to claim 16 or 17 wherein the article is placed entirely within the melted uncured portion of the gel in step (iii).
Claim 19
Independent Claim
20 words
A method according to any one of claims 15 to 18 for attaching, adhering, sealing, protecting or encapsulating an article.
Claim 20
Independent Claim
40 words
A method according to any one of claims 13 to 19 wherein the gel comprises (d) an epoxy compound having at least two epoxy groups and (e) an epoxy hardener, and which method further comprises subjecting the article to heat.
Claim 21
Dependent Claim
17 words
A shaped article obtainable by a method as claimed in any one of claims 13 to 20.
References Cited (Backward Citations)
No citation records indexed.
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