Radiation-curable glass coating composition

• US 6,306,924 B2
• Filed: 08/21/1998
• Issued: 10/23/2001
• Est. Priority Date: 12/07/1993
• Status: Expired due to Fees

• Current Assignee: DSM Desotech Incorporated (DSM-Firmenich AG)
• Original Assignee: DSM Desotech Incorporated (DSM-Firmenich AG)
• Inventors: Szum, David M.
• Primary Examiner(s): Seidleck, James J.
• Assistant Examiner(s): McClendon, Sanza L.
• Application Number:
  US09/137,925
• Publication Number:
  US 20010002410A1
• Time in Patent Office: 1,159 Days
• Field of Search: 522/171, 522/90, 522/96, 522/182, 522/180, 522/113, 522/115, 522/118, 522/120, 522/121, 522/127, 428/380, 428/378, 428/383, 385/128, 385/145
• US Class Current: 522/114
• CPC Class Codes: C03C 17/32 with synthetic or natural resins C03C17/30 takes precedence
• CPC Class Codes: C03C 25/106 Single coatings
• CPC Class Codes: C03C 25/1065 Multiple coatings
• CPC Class Codes: C03C 25/26 Macromolecular compounds or prepolymers
• CPC Class Codes: C08G 18/62 Polymers of compounds having carbon-to-carbon double bonds
• CPC Class Codes: C08G 18/672 Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
• CPC Class Codes: C21D 9/60 with induction heating
• CPC Class Codes: Y02P 10/25 Process efficiency
• CPC Class Codes: Y10T 428/2938 Coating on discrete and individual rods, strands or filaments
• CPC Class Codes: Y10T 428/2942 Plural coatings
• CPC Class Codes: Y10T 428/2947 Synthetic resin or polymer in plural coatings, each of different type

Abstract

This invention provides an improved coating composition for glass substrates that comprises a tetrasubstituted compound. The introduction of a tetrasubstituted compound in a coating composition for a glass substrate, and in particular an optical fiber, acts to delay the rate of deterioration of the glass or optical fiber due to moisture, and improves adhesion between the glass substrate and the coating composition. The introduction of a tetrasubtituted compound into a polymeric coating composition also improves the interlayer adhesion when more than one coating is applied to a glass substrate. This invention further relates to an outer primary coating composition or matrix material that comprises an acid functional ethylenically unsaturated monomer. This invention also provides an improved coated glass substrate having a decreased rate of deterioration due to moisture, improved adhesion between the glass substrate and the coating composition and between the various coatings, wherein the coating composition comprises a tetrasubstituted compound.

Claims

1. A coated optical fiber comprising an inner primary coating and an outer primary coating, said outer primary coating being obtained by curing a composition comprising:

(i) a strong acid functional ethylenically unsaturated monomer; and

(ii) a radiation-curable oligomer.

2. The coated optical fiber of claim 1, wherein said unsaturated monomer comprises an unsaturated moiety selected from the group consisting of vinyl, allyl, vinylether, methacrylate, and acrylate moieties.

3. The coated optical fiber of claim 1, wherein said unsaturated monomer comprises an acid group that completely dissociates in water.

4. The coated optical fiber of claim 1, wherein said unsaturated monomer is a phosphoric acid monoacrylate or a 2-acrylamido-2-methylpropane sulfonic acid.

5. The coated optical fiber of claim 1, wherein said coating has a modulus in the range of about 100 to about 3,000 MPa.

6. The coated optical fiber of claim 1, wherein said coating has a Tg above 23°

C.

7. The coated optical fiber of claim 1, wherein said unsaturated monomer is present in said composition, relative to the total weight of said composition, in an amount of about 0.1 wt % to about 10 wt %.

8. The coated optical fiber of claim 1, wherein said radiation-curable oligomer is a urethane (meth)acrylate oligomer.

9. The coated optical fiber of claim 1, wherein said radiation-curable oligomer comprises polyether diol residues, polyisocyanate residues, and hydroxyfunctional ethylenically unsaturated monomer residues.

10. The coated optical fiber of claim 1, wherein said radiation-curable oligomer consists essentially of polyether diol residues, diisocyanate residues, and hydroxyethylacrylate residues.

11. The coated optical fiber of claim 1, wherein said radiation-curable oligomer is present in said composition, relative to the total weight of said composition, in an amount of 30-80 wt %.

12. The coated optical fiber of claim 1, wherein said radiation-curable oligomer has a molecular weight in the range of about 1,000 to 10,000.

13. The coated optical fiber of claim 1, wherein said composition further comprises a photoinitiator.

14. The coated optical fiber of claim 1, wherein said composition further comprises bisphenol A diglycidyl ether diacrylate.

15. An optical fiber ribbon comprising the coated optical fiber of claim 1.

16. An optical fiber ribbon comprising at least one optical fiber embedded in a matrix material, said matrix material being obtained by curing a composition comprising:

(i) a strong acid functional ethylenically unsaturated monomer; and

(ii) a radiation-curable oligomer.

17. The optical fiber ribbon of claim 16, wherein said unsaturated monomer comprises an unsaturated moiety selected from the group consisting of vinyl, allyl, vinylether, methacrylate, and acrylate moieties.

18. The coated optical fiber of claim 16, wherein said unsatured monomer comprises an acid group that completely dissociated in water.

19. The optical fiber ribbon of claim 16, wherein said unsaturated monomer is a phosphoric acid monoacrylate or a 2-acrylamido-2-methylpropane sulfonic acid.

20. The optical fiber ribbon of claim 16, wherein said radiation-curable oligomer comprises polyether diol residues, polyisocyanate residues, and hydroxyfunctional ethylenically unsaturated monomer residues.