Cationic UV-crosslinkable acrylic polymers for pressure sensitive adhesives
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-020/06
C08F-020/10
C08F-020/32
C08F-002/50
C08J-003/28
B32B-007/12
출원번호
US-0606066
(2012-09-07)
등록번호
US-8796350
(2014-08-05)
발명자
/ 주소
Liu, Yuxia
Palasz, Peter
Paul, Charles W.
Foreman, Paul B.
출원인 / 주소
Henkel US IP LLC
대리인 / 주소
Lehmann, Sun Hee
인용정보
피인용 횟수 :
0인용 특허 :
14
초록▼
An ultraviolet (UV) crosslinkable acrylic pressure sensitive adhesive comprises an acrylic copolymer and a cationic photoinitiator. The acrylic copolymer comprises pendant reactive functional groups. The pressure sensitive adhesive formed from the acrylic copolymer with the pendant reactive function
An ultraviolet (UV) crosslinkable acrylic pressure sensitive adhesive comprises an acrylic copolymer and a cationic photoinitiator. The acrylic copolymer comprises pendant reactive functional groups. The pressure sensitive adhesive formed from the acrylic copolymer with the pendant reactive functional groups result in high green strength and/or high temperature holding strength of the adhesive.
대표청구항▼
1. An ultra-violet curable pressure sensitive adhesive comprising an acrylic polymer and a cationic photoinitiator, wherein said acrylic polymer is prepared from the group consisting of: (i) an acrylic monomer consisting of an acrylic or methacrylic acid derivative of the formula CH2═CH(R1)(COOR2),
1. An ultra-violet curable pressure sensitive adhesive comprising an acrylic polymer and a cationic photoinitiator, wherein said acrylic polymer is prepared from the group consisting of: (i) an acrylic monomer consisting of an acrylic or methacrylic acid derivative of the formula CH2═CH(R1)(COOR2), wherein R1 is H or CH3 and R2 is C1-20 alkyl chain;(ii) a monomer,wherein said monomer comprises a pendant reactive functional group selected from cycloaliphatic epoxide, oxetane or mixtures thereof, and contains from about 0.001 to about 0.015 equivalent per 100 g of said acrylic polymer;wherein the acrylic polymer (a) is essentially free of multi-(meth)acrylate, (b) has a Tg value less than 0° C., and (c) has a weight average molecular weight from about 50,000 to about 1,000,000 g/mol; andwherein the ultra-violet curable pressure sensitive adhesive has a viscosity range of 1,000-500,000 mPa·s at 80-180° C. 2. The ultra-violet curable pressure sensitive adhesive of claim 1 wherein the (ii) monomer contain from about 0.002 to about 0.010 equivalent per 100 g of the acrylic polymer. 3. The ultra-violet curable pressure sensitive adhesive of claim 1 wherein the (ii) monomer is a cycloaliphatic epoxide having the formula: whereinR1 is O, S, C═O, or linear, branched, or cyclic alkylene, or oxyalkylene, arylene,R2 is linear, branched, and cyclic alkyl or alkoxy, aryl, H, halogen, C═O, or part of R1 as fused cycloaliphatic ring through a covalent bond connection,R3 is (CH2)n, n=0-3,X is acrylate or methacrylate, or comprises a —W—Y group, whereW is O, S, amide, carbonate, urethane, urea, siloxane or a combination thereof, andY is —R4—C(R5)═CH2, where R4 is a linear or branched C2-10 alkylene, C2-10 oxyalkylene, C═O, or arylene or derivative thereof, and R5 is H or CH3. 4. The ultra-violet curable pressure sensitive adhesive of claim 1 wherein the cycloaliphatic epoxide has the formula: where R1═H or CH3,or mixtures thereof. 5. The ultra-violet curable pressure sensitive adhesive of claim 4 wherein the cycloaliphatic epoxide is: or mixtures thereof. 6. An ultra-violet curable pressure sensitive adhesive comprising an acrylic polymer and a cationic photoinitiator, wherein said acrylic polymer is prepared from: (i) an acrylic monomer consisting of an acrylic or methacrylic acid derivative of the formula CH2═CH(R1)(COOR2), wherein R1 is H or CH3 and R2 is C1-20 alkyl chain;(ii) a monomer,wherein said monomer comprises a pendant reactive functional group that is present from about 0.001 to about 0.015 equivalent per 100 g of said acrylic polymer;wherein the acrylic polymer (a) is essentially free of multi-(meth)acrylate, (b) has a Tg value less than 0° C., and (c) has a weight average molecular weight from about 50,000 to about 1,000,000 g/mol; andwherein the pendant reactive functional group is a benzophenone having the formula: whereZ is S, O, CH2, or NH,R1-8 are independently H, Cl, Br, I, F, C1-24 alkoxy, C1-24 alkyl, or aryl; and wherein at least one of R1-8 must comprise a —W—X—Y group, whereW is a C1-12 alkylene or C1-12 oxyalkylene,X is carbonate, urethane, urea, tetramethyldisiloxane or a combination thereof, andY is —R9—C(R10)═CH2, where R9 is a linear or branched C2-10 alkylene or C2-10oxyalkylene, or arylene or derivative thereof, and R10 is H or CH3. 7. The ultra-violet curable pressure sensitive adhesive of claim 6 wherein the benzophenone has the formula: or mixtures thereof. 8. The ultra-violet curable pressure sensitive adhesive of claim 1, wherein the cationic photoinitiator has the structure of where R is C3H7, C12H25, W is S, SO, SO2 or CO. 9. The adhesive of claim 8 wherein the cationic photoinitiator is: where R1 and R2 are independently H, CH3, C2H5, C3H7, C12H25, OCH3, OC2H5, OC3H7, or OC12H25. 10. The ultra-violet curable pressure sensitive adhesive of claim 1 further comprising a polyethylene copolymer additive. 11. The ultra-violet curable pressure sensitive adhesive of claim 10, wherein the adhesive has a solvent content of less than about 2% by weight of the total adhesive. 12. An article of manufacture comprising the adhesive of claim 11. 13. An ultra-violet curable pressure sensitive adhesive comprising an acrylic polymer and a cationic photoinitiator, wherein said acrylic polymer comprises: (i) an acrylic monomer consisting of an acrylic or methacrylic acid derivative of the formula CH2═CH(R1)(COOR2), wherein R1 is H or CH3 and R2 is C1-20 alkyl chain;(ii) a monomer, wherein the monomer comprises a plurality of pendant reactive functional groups selected from (1) mono-substituted oxirane, and(2) cycloaliphatic epoxide, oxetane, benzophenone or mixtures thereof, andwherein said monomer contains from about 0.001 to about 0.015 equivalent per 100 g of said acrylic polymer;wherein said acrylic polymer (a) is essentially free of multi-(meth)acrylate (b) has a Tg value less than 0° C., and (c) has a weight average molecular weight from about 50,000 to about 1,000,000 g/mol; andwherein the pendant reactive functional group comprises a benzophenone having the formula: whereZ is S, O, CH2, or NH,R1-8 are independently H, Cl, Br, I, F, C1-24 alkoxy, C1-24 alkyl, or aryl; and wherein at least one of R1-8 must comprise a —W—X—Y group, whereW is a C1-12 alkylene or C1-12 oxyalkylene,X is carbonate, urethane, urea, tetramethyldisiloxane or a combination thereof, andY is —R9—C(R10)═CH2, where R9 is a linear or branched C2-10 alkylene or C2-10oxyalkylene, or arylene or derivative thereof, and R10 is H or CH3. 14. The ultra-violet curable pressure sensitive adhesive of claim 13 wherein the benzophenone has the formula: or mixtures thereof. 15. The ultra-violet curable pressure sensitive adhesive of claim 13, wherein the pendant reactive functional group comprises a mono-substituted oxirane having the formula: where R1═H or CH3 or mixtures thereof. 16. The ultra-violet curable pressure sensitive adhesive of claim 13, wherein the cationic photoinitiator has the structure of where R is C3H7, C12H25, W is S, SO, SO2 or CO. 17. The adhesive of claim 16 wherein the cationic photoinitiator is: where R1 and R2 are independently H, CH3, C2H5, C3H7, C12H25, OCH3, OC2H5, OC3H7, or OC12H25. 18. The ultra-violet curable pressure sensitive adhesive of claim 13 further comprising a polyethylene copolymer additive. 19. The ultra-violet curable pressure sensitive adhesive of claim 18, wherein the adhesive has a solvent content of less than about 2% by weight of the total adhesive. 20. An article of manufacture comprising the adhesive of claim 13. 21. The adhesive of claim 6, wherein the cationic photoinitiator has the structure of where R is C3H7, C12H25, W is S, SO, SO2 or CO. 22. The adhesive of claim 21 wherein the cationic photoinitiator is: where R1 and R2 are independently H, CH3, C2H5, C3H7, C12H25, OCH3, OC2H5, OC3H7, or OC12H25. 23. The ultra-violet curable pressure sensitive adhesive of claim 6 further comprising a polyethylene copolymer additive.
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