US5426008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photocurable self-retainable gel, shaped article prepared therefrom, applications and preparations thereof
Assignee: National Starch and Chemical Investment Holding Corp
•
Filing: 1993-11-15
•
Granted: 1995-06-20
•
Expires: 2013-11-15
Abstract
Abstract A photocurable gel suitable for articles such as printing plates, photoresists and the like is disclosed. The photocurable eel 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
- 👤 Yuichi Mori
- 👤 Hiroshi Samukawa
- 👤 Kazuhide Saigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:09
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: 25
Claim 1
Independent Claim
118 words
A method of preparing an article, wherein said method comprises: (i) exposing a photocurable self-retainable gel to actinic light through an image-bearing transparency whereby portions of said gel are cured, said gel comprising (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, said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling, (ii) melting uncured portions of said gel at a temperature above the flow temperature of said gel, and (iii) removing the melted uncured portions.
Claim 2
Independent Claim
118 words
A method of preparing an article, wherein said method comprises: (i) exposing a photocurable self-retainable gel to actinic light through an image-bearing transparency whereby portions of said gel are cured, said gel comprising (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, said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling, (ii) melting uncured portions of said gel at a temperature above the flow temperature of said gel, and (iii) removing the melted uncured portions.
Claim 3
Dependent Claim
38 words
A method according to claim 1 wherein said gel further comprises (d) an epoxy compound having at least two epoxy groups and (e) an epoxy hardener, and said method further comprises (iv) subjecting said article to heat treatment.
Claim 4
Dependent Claim
10 words
An article prepared according to the method of claim 2.
Claim 5
Dependent Claim
14 words
An article according to claim 3 wherein said article is a relief printing plate.
Claim 6
Dependent Claim
12 words
An article according to claim 3 wherein said article is a photoresist.
Claim 7
Dependent Claim
10 words
An article prepared according to the method of claim 1.
Claim 8
Dependent Claim
14 words
An article according to claim 6 wherein said article is a relief printing plate.
Claim 9
Dependent Claim
12 words
An article according to claim 6, wherein said article is a photoresist.
Claim 10
Independent Claim
120 words
A method for processing an article, wherein the method comprises the steps of: (i) melting a photocurable self-retainable gel at a temperature above the flow temperature of said gel to form a sol, wherein said gel is to be provided on said article and said 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, said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling; (ii) cooling said sol to a temperature below the flow temperature of said gel to convert said sol to a gel; and (iii) exposing said gel to an actinic light.
Claim 11
Independent Claim
120 words
A method for processing an article, wherein the method comprises the steps of: (i) melting a photocurable self-retainable gel at a temperature above the flow temperature of said gel to form a sol, wherein said gel is to be provided on said article and said 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, said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling; (ii) cooling said sol to a temperature below the flow temperature of said gel to convert said sol to a gel; and (iii) exposing said gel to an actinic light.
Claim 12
Dependent Claim
38 words
A method according to claim 9 wherein said gel further comprises (d) an epoxy compound having at least two epoxy groups and (e) an epoxy hardener, and said method further comprises (iv) subjecting said gel to heat treatment.
Claim 13
Dependent Claim
13 words
A method according to claim 10 wherein (iii) is conducted prior to (ii).
Claim 14
Dependent Claim
25 words
A method according to claim 9, wherein said processing comprises a member of the group of processes consisting of attaching, adhering, sealing, protecting and encapsulating.
Claim 15
Dependent Claim
13 words
A method according to claim 9 wherein (iii) is conducted prior to (ii).
Claim 16
Independent Claim
132 words
A method for processing an article, wherein said method comprises: (i) exposing a portion of a photocurable self-retainable gel to actinic light, said gel comprising: (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, said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling; and said exposed portion having a larger surface area than the surface area of said article, (ii) melting the uncured portion of said gel at a temperature above the flow temperature of said gel, (iii) placing said article in the melted, uncured portion of said gel, (iv) exposing said melted, uncured portion to actinic light to process the shaped article with the cured gel.
Claim 17
Independent Claim
132 words
A method for processing an article, wherein said method comprises: (i) exposing a portion of a photocurable self-retainable gel to actinic light, said gel comprising: (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, said gel being solid at ambient temperature and capable of undergoing reversible gel/sol transition by heating or cooling; and said exposed portion having a larger surface area than the surface area of said article, (ii) melting the uncured portion of said gel at a temperature above the flow temperature of said gel, (iii) placing said article in the melted, uncured portion of said gel, (iv) exposing said melted, uncured portion to actinic light to process the shaped article with the cured gel.
Claim 18
Dependent Claim
38 words
A method according to claim 14 wherein said gel further comprises (d) an epoxy compound having at least two epoxy groups and (e) an epoxy hardener, and said method further comprises (v) subjecting said shaped article to heat.
Claim 19
Dependent Claim
27 words
A method according to claim 14 further comprising cooling said melted portion in (iii) to a temperature below the flow temperature of said gel prior to (iv).
Claim 20
Dependent Claim
28 words
A method according to claim 15 further comprising cooling said melted portion in (iii) to a temperature below the flow temperature of said gel prior to (iv) .
Claim 21
Dependent Claim
20 words
A method according to claim 15, wherein said article is entirely placed in said melted uncured portion in step (iii).
Claim 22
Dependent Claim
20 words
A method according to claim 15, wherein said article is partially placed in said melted uncured portion in step (iii).
Claim 23
Dependent Claim
20 words
A method according to claim 14, wherein said article is entirely placed in said melted uncured portion in step (iii).
Claim 24
Dependent Claim
20 words
A method according to claim 14, wherein said article is partially placed in said melted uncured portion in step (iii).
Claim 25
Dependent Claim
25 words
A method according to claim 14 wherein said processing comprises a member of the group of processes consisting of attaching, adhering, sealing, protecting and encapsulating.
References Cited (Backward Citations)
JPS4855946A
Cited
JPS50128773A
Cited
JPS5340615A
Cited
US4125700A
Cited
JPS5521862A
Cited
JPS5528054A
Cited
JPS62138845A
Cited
JPS62254142A
Cited
JPS638648A
Cited
JPH01131548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-19 | 1998-12-19 | 1999-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-19 | 2002-12-19 | 2003-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-19 | 2006-12-19 | 2007-06-20 | $7700.00 | Window Closed / Lapsed |