摘要:
A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having a degree of saponification of not less than 30 mol% and less than 75 mol% and having a viscosity average degree of polymerization of less than 300; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided that is good in thermal stability while being shaped and with which a shaped article of excellent transparency can be obtained.
摘要:
A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having a degree of saponification of not less than 30 mol% and less than 75 mol% and having a viscosity average degree of polymerization of less than 300; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided that is good in thermal stability while being shaped and with which a shaped article of excellent transparency can be obtained.
摘要:
A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a polyvinyl alcohol having a viscosity average degree of polymerization of from 100 to 3000 and having a ratio Mw/Mn of a weight average molecular weight Mw to a number average molecular weight Mn of from 2.2 to 4.9; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided that enables to obtain a shaped article thereof excellent in thermal stability while being shaped and less colored.
摘要:
The present invention relates to ethylene-vinyl alcohol copolymer particles, comprising an ethylene-vinyl alcohol copolymer having an ethylene unit content of 1 mol% or more and less than 20 mol%, a viscosity-average polymerization degree of 200 to 5000, and a saponification degree of 80 to 99.99 mol%, wherein a crystallinity in water Cw (30 °C) at 30 °C and a crystallinity in water Cw (70 °C) at 70 °C as determined by pulse NMR satisfy formula (I). There is thus provided ethylene-vinyl alcohol copolymer particles having excellent solubility in water and excellent gas barrier performance.
摘要:
Provided is a polyoxyalkylene modified vinyl alcohol-based polymer comprising a polyoxyalkylene group in a side chain, wherein the polymer has a viscosity average degree of polymerization of not less than 150 and not more than 5000, a degree of saponification of not less than 40 mol% and not more than 99. 99 mol%, and a polyoxyalkylene group modification rate of not less than 0.05 mol% and not more than 10 mol%; and the polyoxyalkylene group is composed of a polyoxypropylene block and a (poly) oxyethylene block and is represented by the following general formula (I). Such polymer is excellent in temperature-sensitive thickening properties. (in the general formula (I), R 1 denotes a hydrogen atom or an alkyl group having a carbon number of from 1 to 8; either one of R 2 and R 3 is a methyl group and the other is a hydrogen atom; and 10 ‰¤ m ‰¤ 40 and 1 ‰¤ n ‰¤ 50).
摘要:
This invention provides a vinyl alcohol polymer-containing coating agent for paper, which, despite the fact that a curing step after coating the coating agent onto a paper surface can be omitted, can form a layer (for example, a coating layer or a color developing layer) having excellent water resistance and having no significant susceptibility to yellowing with the elapse of time. The coating agent is an aqueous composition comprising a vinyl alcohol polymer (A) satisfying a formula “X + 0.2Y > 95”, wherein X represents the content of vinyl alcohol units, % by mole; and Y represents the content of ethylene units, % by mole, and an addition condensation product (B) between ethylene urea and glyoxal. In the addition condensation product (B), the content of the terminal aldehyde group per g of the solid is 1.2 to 3.0 (mmol). The weight ratio on a solid basis between the vinyl alcohol polymer (A) and the addition condensation product (B) is in the range of (A) : (B) = 99 : 1 to 50 : 50. In the above formula, X
摘要:
A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having a degree of saponification of from 30 to 99. 9 mol%, having a viscosity average degree of polymerization of 1000 or less, and having a carboxyl group, a sulfonic acid group, or a salt thereof at a terminal; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. In addition, a polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having an alkyl group with a carbon number of 6 or more at a terminal, having a degree of saponification of from 30 to 99. 9 mol%, and having a viscosity average degree of polymerization of 1000 or less; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided which is excellent in thermal stability while being shaped and with which a less colored shaped article can be obtained.
摘要:
[Object] To provide an aqueous emulsion which is excellent in mechanical stability and pigment compatibility and further is excellent in film transparency and solvent resistance, and a coating by the use thereof. [Solution Means] The object is achieved by the aqueous emulsion including a polymer having at least one monomer unit selected from the group consisting of a (meth)acrylate ester monomer unit, a styrene monomer unit and a diene monomer unit as a dispersoid, further including a vinyl alcohol polymer (A) having 1.9 mol% or more 1,2-glycol bond and a saponification degree of 70 mol% or more and a surfactant (B) as dispersants, wherein a weight ratio of (A) / (B) is 50/50 to 95/5 and an average particle diameter of dispersed particles is 0.5 µm or less, and the coating by the use thereof.
摘要:
The present invention provides a modified vinyl alcohol polymer having a side chain with an ethylenic double bond, and having reduced a water-insoluble content and superior storage stability in the form of an aqueous solution. The present invention also provides a method for producing such a modified vinyl alcohol polymer. A dispersion stabilizer for suspension polymerization comprising the modified vinyl alcohol polymer is also provided that provides superior polymerization stability during suspension polymerization of a vinyl compound, and with which reduced formation of coarse particles, high bulk specific gravity, and superior plasticizer absorbability can be achieved, in addition to reducing fisheyes. The present invention also provides a method for producing a vinyl polymer. The present invention relates to a modified vinyl alcohol polymer (A) having a degree of saponification of 68 mol% or more and less than 99.9 mol%, and a viscosity-average degree of polymerization of 200 or more and less than 3,000, and comprising a side chain with 0.01 mol% or more and less than 0.50 mol% of a double bond derived from an esterification agent, the esterification agent being one or more selected from the group consisting of (i) itaconic acid and/or derivatives thereof, and (ii) methacrylic acid and/or derivatives thereof, and the modified vinyl alcohol polymer (A) having a peak width W 0.05h of at least 2.85 minutes and less than 3.70 minutes at a height of 5% from the baseline in a peak measured by HPLC.