Modified polyvinyl alcohol and process for producing the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-222/06
C08F-216/06
C08F-008/44
C08F-222/14
출원번호
US-0816791
(2005-08-29)
등록번호
US-10005867
(2018-06-26)
우선권정보
JP-2005-063395 (2005-03-08)
국제출원번호
PCT/JP2005/015684
(2005-08-29)
§371/§102 date
20070821
(20070821)
국제공개번호
WO2006/095462
(2006-09-14)
발명자
/ 주소
Watanabe, Satoshi
Otake, Hirohisa
출원인 / 주소
Denki Kagaku Kogyo Kabushiki Kaisha
대리인 / 주소
Oblon, McClelland, Maier & Neustadt, L.L.P.
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
The present invention provides modified PVA having unsaturated double bonds derived from a specific monomer in the main chain of the molecule. A modified polyvinyl alcohol containing bond units of the formula (1) having double bonds in its molecular main chain: wherein each of X1 and X2 is a C1-12
The present invention provides modified PVA having unsaturated double bonds derived from a specific monomer in the main chain of the molecule. A modified polyvinyl alcohol containing bond units of the formula (1) having double bonds in its molecular main chain: wherein each of X1 and X2 is a C1-12 lower alkyl group, a hydrogen atom or a metal atom, g is an integer of from 0 to 3, h is an integer of from 0 to 12, Y1 is a hydrogen atom or —COOM, and M is a hydrogen atom, an alkyl group or a metal atom.
대표청구항▼
1. A modified polyvinyl alcohol containing bond units of formula (1) in its molecular main chain: wherein each of X1 and X2 is a methyl group, g is an integer of from 0 to 3, h is 0, Y1 is a hydrogen atom; and 0 to 20 mol % of copolymerizable monomersobtained by copolymerizing at least one monomer h
1. A modified polyvinyl alcohol containing bond units of formula (1) in its molecular main chain: wherein each of X1 and X2 is a methyl group, g is an integer of from 0 to 3, h is 0, Y1 is a hydrogen atom; and 0 to 20 mol % of copolymerizable monomersobtained by copolymerizing at least one monomer having an ethylenically unsaturated double bond of formula (3) and a monomer having a vinyl ester unit by solution polymerization in methanol and saponifying an obtained copolymer wherein each of X3 and X4 is a methyl group i is 0, Y2 is a hydrogen atom wherein said monomer having an ethylenically unsaturated double bond and said monomer having a vinyl ester unit are continuously added to a polymerizer andwherein said modified polyvinyl alcohol has a saponification degree of from 30 to 99.9 mol % and does not contain units from polymerization of any of itaconic acid, maleic acid and maleic anhydride. 2. The modified polyvinyl alcohol according to claim 1, which shows an absorbance of at least 0.05 at 270 nm in the ultraviolet absorption spectrum of its 0.2 mass % aqueous solution, methanol solution or water/methanol mixed solution. 3. The modified polyvinyl alcohol according to claim 1, which shows a peak top at 265 to 275 nm in the ultraviolet absorption spectrum attributable to a structure of formula (2): 4. The modified polyvinyl alcohol according to claim 1, wherein the content of unmodified polyvinyl alcohol residues is at most 25 mass %. 5. A process for producing the modified polyvinyl alcohol as defined in claim 1, which comprises copolymerizing at least one monomer of formula (3), a monomer having a vinyl ester unit; and 0 to 20 mol % of copolymerizable monomers, and then saponifying the obtained copolymer: wherein each of X3 and X4 is a methyl group i is 0, Y2 is a hydrogen atom. 6. The process for producing the modified polyvinyl alcohol according to claim 5, which comprises copolymerizing, in addition to said at least one monomer of formula (3) and said monomer having a vinyl ester unit, other monomers copolymerizable with these monomers, and then saponifying the obtained copolymer. 7. The modified polyvinyl alcohol according to claim 1, wherein a content of monomer having an ethylenically unsaturated double bond in the modified polyvinyl alcohol is from 0.1 to 50 mol %. 8. The modified polyvinyl alcohol according to claim 1, wherein a content of monomer having an ethylenically unsaturated double bond in the modified-polyvinyl alcohol is from 0.1 to 10 mol %. 9. The modified polyvinyl alcohol according to claim 1, having a number average molecular weight of from 1,900 to 66,500. 10. The modified polyvinyl alcohol according to claim 1, having a number average molecular weight of from 3,800 to 28,500. 11. The modified polyvinyl alcohol according to claim 1, wherein a 0.2 mass % aqueous, methanol or aqueous methanol solution of said modified polyvinyl alcohol has an absorbance at 270 nm of at least 0.05. 12. The modified polyvinyl alcohol according to claim 1, wherein a 0.2 mass % aqueous, methanol or aqueous methanol solution of said modified polyvinyl alcohol has an absorbance at 270 nm of at least 0.10. 13. The modified polyvinyl alcohol according to claim 1, obtained by copolymerizing at least one monomer having an ethylenically unsaturated double bond of formulae (3) and a monomer having a vinyl ester unit. 14. The modified polyvinyl alcohol according to claim 13, wherein the at least one monomer having an ethylenically unsaturated double bond of formulae (3) is dimethyl maleate.
Taniguchi Yasuo (Quni JPX) Asano Toshio (Quni JPX) Funami Haruo (Quni JPX) Itou Kouichi (Quni JPX), Stabilizer or dispersing agent for use in a suspension polymerization of a vinyl compound comprising a modified and part.
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