Hot-melt adhesive for glueing DVDs

• US 6,767,424 B1
• Filed: 08/03/2001
• Issued: 07/27/2004
• Est. Priority Date: 10/20/1998
• Status: Expired due to Fees

• Current Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Original Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Inventors: Bonke, Dirk, Kopannia, Siegfried, Maassen, Ulrike, Butterbach, Ruediger
• Primary Examiner(s): Aftergut, Jeff H.
• Assistant Examiner(s): GOFF II, JOHN L
• Application Number:
  US09/807,837
• Time in Patent Office: 1,089 Days
• Field of Search: 156/327, 156/314, 156/245, 428/64.1, 428/64.4, 428/65.2, 524/487, 369/283, 369/286
• US Class Current: 156/245
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 53/025 modified
• CPC Class Codes: G11B 7/26 Apparatus or processes specially adapted for the manufacture of record carriers

Abstract

The present invention relates to a process for preparing a digital versatile disc. The process of the present invention includes providing a hot melt adhesive containing at least one thermoplastic elastomer, at least one hydrocarbon resin, at least one poly-α-olefin, and at least one polar wax, and providing at least two disc blanks. The hot melt adhesive is applied directly or indirectly to at least one of the blanks and the blanks are bonded together using the hot melt adhesive. The present invention also provides a digital versatile disc containing the hot melt adhesive.

Claims

1. A process for preparing a digital video disc comprising

(a) providing at least two blanks;

(b) providing a hot melt adhesive comprising

(i) 10 weight percent to 40 weight percent of at least one thermoplastic elastomer,

(ii) 15 weight percent to 50 weight percent of at least one hydrocarbon resin,

(iii) 10 weight percent to 40 weight percent of at least one poly-α

-olefin, and

(iv) 10 weight percent to 45 weight percent of at least one polar wax bearing functional groups having a molecular weight range of 4,000 to 80,000;

(c) applying the hot melt adhesive directly or indirectly onto at least one of the blanks; and

(d) bonding the two or more blanks together using the hot melt adhesive.

2. The process of claim 1, wherein the thermoplastic elastomer comprises one or more styrene/diene block copolymers, styrene/isoprene/styrene copolymers or styrene/butadiene/styrene copolymers, or at least partly hydrogenated derivatives there of, or mixtures there of.

3. The process of claim 1, wherein the hydrocarbon resin comprises one or more cycloaliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, aliphatic/aromatic hydrocarbon resins or petroleum hydrocarbon resins, or hydrogenation products there of, or mixtures there of.

4. The process of claim 1 wherein the poly-α

-olefin comprises one or more aractic α

-olefin copolymers or atactic α

-olefin terpolymers, wherein the copolymers or terpolymers have a molecular weight range of 5,000 to 30,000 and comprise polymerized units of ethylene, propylene or 1-butene, or combinations there of.

5. The process of claim 1 wherein the polar wax comprises one or more functionalized polyolefins having polymerized units of ethylene or propylene, or combinations there of, and are functionalized with at least one acrylic acid, methacrylic acid, C_1-4 esters of acrylic acid or methacrylic acid, maleic acid, itaconic acid, fumaric acid, vinyl acetate, or carbon monoxide or mixtures there of.

6. The process of claim 5, wherein the functionalized polyolefins have a saponification or acid value of 2 to 50 mg KOH/g.

7. The process of claim 1 wherein the hot melt adhesive further comprises one or more fillers, pigments, plasticizers, rackifying resins, antiagers, antioxidants, UV stabilizers or coupling agents, or combinations there of.

8. The process of claim 1 wherein the thermoplastic elastomer comprises one or more styrene/diene block copolymers, styrene/isoprene/styrene copolymers or styrene/butadiene/styrene copolymers, or at least partly hydrogenated derivatives there of, or mixtures there of, wherein the hydrocarbon resin comprises one or more cycloaliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, aliphatic/aromatic hydrocarbon resins or petroleum hydrocarbon resins, or hydrogenation products there of, or mixtures there of, wherein the poly-α

-olefin comprises one or more atactic α

-olefin copolymers or atactic α

-olefin terpolymers having a molecular weight range of 5,000 to 30,000 and comprising polymerized units of ethylene, propylene or 1-butene, or combinations there of, and wherein the polar wax comprises one or more functionalized polyolefins.

9. The process of claim 8 wherein the hot melt adhesive further comprises one or more fillers, pigments, plasticizers, tackifying resins, antiagers, antioxidants, UV stabilizers, or coupling agents or combinations there of.

10. The process of claim 1 further comprising the steps of

(e) applying an information layer to at least one of the blanks, and

(f) coating the information layer with a light-reflecting layer, wherein the hot melt adhesive is applied to the blank after the blank is coated with the reflective layer.

11. The process of claim 10 wherein an anti-corrosion layer is applied to the light reflecting layer prior to the application of the hot melt adhesive.

12. The process of claim 10 further comprising applying a print layer to at least one of the blanks wherein the print layer comprises graphics or text, or combinations there of.

13. The process of claim 12 wherein the hot melt adhesive is also applied to the print layer.

14. The process of claim 10 wherein the thermoplastic elastomer comprises one or more styrene/diene block copolymers, styrene/isoprene/styrene copolymers or styrene/butadiene/styrene copolymers, or at least partly hydrogenated derivatives there of, or mixtures there of, wherein the hydrocarbon resin comprises one or more cycloaliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, aliphatic/aromatic hydrocarbon resins or petroleum hydrocarbon resins, or hydrogenation products there of, or mixtures therof, wherein the poly-α

-olefin comprises one or more atactic α

-olefin copolymers or atactic α

-olefin terpolymers having a molecular weight range of 5,000 to 30,000 and comprising polymerized units of ethylene, propylene or 1-butene, or combinations there of, and wherein the polar wax comprises one or more functionalized polyolefins.

15. A digital video disc prepared by the process of claim 1.

16. A digital video disc comprising

(a) at least two blanks, wherein each blank has an inner surface;

(b) at least one information layer located on the inner surface of a first blank;

(c) at least one light reflecting layer located on the information layer;

(d) at least one layer of hot melt adhesive located between the light reflecting layer of the first blank and a second blank, wherein the hot melt adhesive bonds the first and second blanks together and comprises

(i) 10 weight percent to 40 weight percent of at least one thermoplastic elastomer,

(ii) 15 weight percent to 50 weight percent of at least one hydrocarbon resin,

(iii) 10 weight percent to 40 weight percent of at least one poly-α

-olefin, and

(iv) 10 weight percent to 45 percent of at least one polar wax bearing functional groups having a molecualr weight range of 4,000 to 80,000.

17. The digital video disc of claim 16 wherein the second blank comprises a print layer located on the inner surface of the second blank, the print layer comprising graphics or text, or combinations there of, and wherein the hot melt adhesive layer is located between the print layer of the second blank and the light reflecting layer of the first blank.

18. The digital video disc of claim 17 wherein the thermoplastic elastomer comprises one or more styrene/diene block copolymers, styrene/isoprene/styrene copolymers or stryene/butadiene/styrene copolymers, or at least partly hydrogenated derivatives there of, or mixtures of thereof, wherein the hydrocarbon resin comprises one or more cycloaliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, aliphatic/aromatic hydrocarbon resins or petroleum hydrocarbon resins, or hydrogenation products there of, or mixtures thereof, wherein the poly-α

-olefin comprises one or more aractic α

-olefin copolymers or aractic α

-olefin terpolymers having a molecular weight range of 5,000 to 30,000 and comprising polymerized units of ethylene, propylene or 1-butene, or combination thereof, and wherein the polar wax comprises one or more functionalized polyolefins.

19. The digital video disc of claim 16 wherein the thermoplastic elastomer comprises one or more styrene/diene block copolymers, styrene/isoprene/styrene copolymers or styrene/butadiene/styrene copolymers, or at least partly hydrogenated derivatives there of, or mixtures there of, wherein the hydrocarbon resin comprises one or more cycloaliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic hydrocarbon resins, aliphatic/aromatic hydrocarbon resins or petroleum hydrocarbon resins, or hydrogenation products there of, or mixtures there of, wherein the poly-α

-olefin comprises one or more atactic α

-olefin copolymers or atactic α

-olefin terpolymers having a molecular weight range of 5,000 to 30,000 and comprising polymerized units of ethylene, propylene or 1-butene, or combinations there of, and wherein the polar wax comprises one or more functionalized polyolefins.