Cellulose based coating composition curable with ultraviolet ray

• US 6,303,670 B1
• Filed: 02/25/2000
• Issued: 10/16/2001
• Est. Priority Date: 02/25/2000
• Status: Active Grant

• Current Assignee: Nippon Paper Industries Company Limited (Nippon Paper Group Incorporated)
• Original Assignee: Nippon Paper Industries Company Limited (Nippon Paper Group Incorporated)
• Inventors: Fujino, Kenichi, Thames, Shelby F.
• Primary Examiner(s): Seidleck, James J.
• Assistant Examiner(s): MCCLENDON, SANZA L
• Application Number:
  US09/513,079
• Time in Patent Office: 599 Days
• Field of Search: 522/88, 522/100, 522/101, 522/103, 522/122, 522/168, 522/170, 527/300, 527/315
• US Class Current: 522/88
• CPC Class Codes: C08F 2/48 by ultraviolet or visible light
• CPC Class Codes: C08L 2666/26 Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C09D 101/08 Cellulose derivatives
• CPC Class Codes: C09D 101/12 Cellulose acetate
• CPC Class Codes: C09D 163/00 Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
• CPC Class Codes: G03F 7/038 Macromolecular compounds which are rendered insoluble or differentially wettable G03F7/075 takes precedence; macromolecular azides G03F7/012; macromolecular diazonium compounds G03F7/021

Abstract

Disclosed is an ultraviolet-curable cellulosic coating composition comprising cellulose acetate, diepoxy compound and photo cationic polymerization catalyst. The objective is to provide a novel ultraviolet-curable cellulosic coating composition capable of forming a film excellent in the adherence to polar substrate, solvent resistance, gloss and impact resistance.

Claims

1. An ultraviolet-curable cellulosic coating composition comprising (A) 5 to 30 parts by weight of cellulose acetate with number average molecular weight of 1,500˜

5,000 and average number of free hydroxyl groups in one molecule of 1˜

3, (B) 70 to 95 parts by weight of a diepoxy compound and (C) not less than 0.1 part to not more than 5 parts by weight of a photo cationic polymerization catalyst.

2. The ultraviolet-curable cellulosic coating composition of claim 1, wherein (A) the cellulose acetate is compatible with (B) the diepoxy compound to give homogeneous mixture without solvent.

3. The ultraviolet-curable cellulosic coating composition of claim 1 or 2, where (B) the diepoxy compound consists of at least one or more of aliphatic epoxy compound, alicyclic epoxy compound and glycidyl ether derived from aliphatic alcohol.

4. An ultraviolet-curable cellulosic coating composition, wherein (C) a photo cationic polymerization catalyst of 0.1˜

5 wt. % is added to a compatible and homogeneous mixture of 100 weight parts substantially consisting of (A) 5˜

30 weight parts of a cellulose acetate with number average molecular weight of 1,500˜

5,000 and average number of free hydroxyl groups in one molecule of 1˜

3, and (B) 70˜

95 weight parts of a diepoxy compound.