US4690502A
Expired / Lapsed
US
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Ultraviolet curable optical glass fiber coatings from acrylate terminated, end-branched polyurethane polyurea oligomers
Assignee: Stamicarbon BV
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Filing: 1985-07-08
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Granted: 1987-09-01
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Expires: 2005-07-08
Abstract
Abstract Ultraviolet curing oligomers and liquid coating compositions based thereon are disclosed which cure with ultraviolet light in the presence of a photoinitiator. The coating compositions can provide either a single coating for optical glass fiber which resists microbending difficulties down to around -40° C., or a topcoat for overcoating softer buffer coatings which resist microbending down to around -60° C. The coating compositions consist essentially of the linear polyacrylate-terminated polyurethane polyurea oligomer in admixture with an ultraviolet curable liquid acrylate or polyacrylate to provide the liquidity needed for application and to adjust the hardness or softness of the cured coating for the selected single coat or topcoat utility. The linear polyacrylate-terminated polyurethane polyurea oligomer comprises a linear polyurethane terminated with an essentially monohydric adduct of low molecular weight diprimary amine with from about 1 to about 2.5 moles of monoepoxide per mole of diamine and reacted with a monohydric acrylate to leave about 1 hydroxy group per molecule. The several acrylate terminal groups increases the toughness and the cure speed.
Inventors
- 👤 John M. Zimmerman
- 👤 Timothy E. Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:26
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/1065; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/67; C08G18/671; C08G18/672; C08G18/70; C08G18/81; C08G18/8141; C08G18/815; C08G18/8158; C08G18/8175; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
164 words
A ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of a photoinitiator, either provides a single coating for optical glass fiber having adequate strength at room or expected elevated temperature, and a low tensile modulus which remains low to resist microbending difficulties down to around -40° C., or which can be used to overcoat softer buffer coatings which remain soft to resist microbending difficulties down to around -60° C., said coating composition consisting essentially of a linear polyacrylate-terminated polyurethane polyurea oligomer comprising a linear polyurethane terminated with an essentially monohydric adduct of low molecular weight diprimary amine with from about 1 to about 2.5 moles of monoepoxide per mole of diamine and reacted with acrylate-functional monoisocyanate to leave about 1 hydroxy group per molecule, and an ultraviolet curable liquid acrylate or polyacrylate to provide the liquidity needed for application and to adjust the hardness or softness of the cured coating for the selected single coat or topcoat utility.
Claim 2
Dependent Claim
164 words
A ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of a photoinitiator, either provides a single coating for optical glass fiber having adequate strength at room or expected elevated temperature, and a low tensile modulus which remains low to resist microbending difficulties down to around -40° C., or which can be used to overcoat softer buffer coatings which remain soft to resist microbending difficulties down to around -60° C., said coating composition consisting essentially of a linear polyacrylate-terminated polyurethane polyurea oligomer comprising a linear polyurethane terminated with an essentially monohydric adduct of low molecular weight diprimary amine with from about 1 to about 2.5 moles of monoepoxide per mole of diamine and reacted with acrylate-functional monoisocyanate to leave about 1 hydroxy group per molecule, and an ultraviolet curable liquid acrylate or polyacrylate to provide the liquidity needed for application and to adjust the hardness or softness of the cured coating for the selected single coat or topcoat utility.
Claim 3
Dependent Claim
29 words
A coating composition as recited in claim 1 in which said polyacrylate-terminated oligomer constitutes at least about 30% up to about 80% of the reactive components in the coating.
Claim 4
Dependent Claim
29 words
A coating composition as recited in claim 1 in which said polyacrylate-terminated oligomer constitutes at least about 40% up to about 70% of the reactive comonents in the coating.
Claim 5
Dependent Claim
39 words
A coating composition as recited in claim 1 adapted for topcoat application in which said ultraviolet curable liquid comprises an acrylate-functional monomer whose homopolymer has a glass transition temperature above about 55° C. in the absence of acrylic acid.
Claim 6
Dependent Claim
28 words
A coating composition as recited in claim 1 adapted for topcoat application in which said ultraviolet curable liquid comprises a polyacrylate having a molecular weight below about 600.
Claim 7
Dependent Claim
34 words
A coating composition as recited in claim 1 adapted for single coat application in which said ultraviolet curable liquid comprises an acrylate-functional monomer whose homopolymer has a glass transition temperature less than 0° C.
Claim 8
Dependent Claim
34 words
A coating composition as recited in claim 1 adapted for single coat application in which said ultraviolet curable liquid comprises an acrylate-functional monomer whose homopolymer has a glass transition temperature less than -20° C.
Claim 9
Dependent Claim
55 words
A coating composition as recited in claim 1 adapted for single coat application in which said ultraviolet curable liquid comprises a liquid linear aliphatic diacrylate in which the two acrylate groups are separated by at least a chain of 6 carbon atoms or by a molecular weight of at least 400 up to about 4000.
Claim 10
Dependent Claim
25 words
A coating composition as recited in claim 8 in which said two acrylate groups are separated by a molecular weight of from 600 to 2500.
Claim 11
Dependent Claim
20 words
A coating composition as recited in claim 9 in which said two acrylate groups are separated by a polyoxybutylene structure.
Claim 12
Dependent Claim
28 words
A coating composition as recited in claim 8 in which said linear liquid diacrylate is a polyoxybutylene glycol diacrylate having a molecular weight of from 800 to 2000.
Claim 13
Dependent Claim
42 words
A coating composition as recited in claim 1 in which said polyacrylate-terminated polyurethane oligomer has a molecular weight of about 1000 to about 8000 with one linking group selected from urethane and urea groups for every 200 to 900 units of weight.
Claim 14
Dependent Claim
72 words
A coating composition as recited in claim 1 in which said polyacrylate-terminated polyurethane polyurea oligomer is formed using diiscoyanate in which a linear aliphatic chain containing at least 6 carbon atoms separates the two isocyanate groups, and this diisocyanate is reacted with a polyether or polyester containing alkylene groups having from 1 to 6 carbon atoms and a molecular weight in the range of 500 to 4000, to form a polyurethane diisocyanate.
Claim 15
Dependent Claim
19 words
A coating composition as recited in claim 13 in which said diisocyanate is provided by dimer fatty acid diisocyanate.
Claim 16
Dependent Claim
19 words
A coating composition as recited in claims 14 in which said dimer fatty acid diisocyanate contains 36 carbon atoms.
Claim 17
Dependent Claim
33 words
A coating composition as recited in claim 14 in which said diisocyanate is reacted with a polyether which is a polyoxyalkylene glycol having a molecular weight in the range of 1000 to 3000.
Claim 18
Dependent Claim
19 words
A coating composition as recited in claim 16 in which said oxyalkylene glycol contains 3 or 4 carbon atoms.
Claim 19
Dependent Claim
16 words
A coating composition as recited in claim 1 in which said monohydric acrylate is 2-hydroxyethyl acrylate.
Claim 20
Dependent Claim
51 words
A linear polyacrylate-terminated polyurethane polyurea oligomer which contains a linear polyurethane terminated with an essentially monohydric adduct of low molecular weight diprimary amine with from about 1 to about 2.5 moles of monoepoxide per mole of diamine and reacted with a monohydric acrylate to leave about 1 hydroxy group per molecule.
Claim 21
Dependent Claim
51 words
A linear polyacrylate-terminated polyurethane polyurea oligomer which contains a linear polyurethane terminated with an essentially monohydric adduct of low molecular weight diprimary amine with from about 1 to about 2.5 moles of monoepoxide per mole of diamine and reacted with a monohydric acrylate to leave about 1 hydroxy group per molecule.
Claim 22
Dependent Claim
35 words
An oligomer as recited in claim 19 in which said monoepoxide is an oxide containing from 2-4 carbon atoms and is used in an amount of from 1.1 to 2.0 moles per mole of diamine.
Claim 23
Dependent Claim
21 words
An oligomer as recited in claim 20 in which said diamine is a polyoxypropylene diamine and said monoepoxide is 1,2-propylene oxide.
Claim 24
Dependent Claim
25 words
An oligomer as recited in claim 21 in which said monoepoxide is used in an amount of about 1.4 moles per mole of the diamine.
Claim 25
Dependent Claim
41 words
An oligomer as recited in claim 19 in which said polyacrylate-terminated polyurethane oligomer has a molecular weight of about 1000 to about 8000 with one linking group selected from urethane and urea groups for every 200 to 900 units of weight.
Claim 26
Dependent Claim
16 words
An optical glass fiber single coated with an ultraviolet-cured coating of the composition of claim 6.
Claim 27
Dependent Claim
16 words
An optical glass fiber single coated with an ultraviolet-cured coating of the composition of claim 8.
Claim 28
Dependent Claim
15 words
An optical glass fiber topcoated with an ultraviolet-cured coating of the composition of claim 4.
Claim 29
Dependent Claim
15 words
An optical glass fiber topcoated with an ultraviolet-cured coating of the composition of claim 5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |