Title:
POLYVINYL ACETAL AND LAMINATED GLASS INTERLAYER COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2015/019441
Kind Code:
A1
Abstract:
A polyvinyl acetal which has a degree of acetalization of 40 to 90 mol%, a content of a vinyl ester monomer unit of 0.1 to 20 mol%, and a viscosity-average polymerization degree of 200 to 5000, wherein when the polyvinyl acetal is heated for three hours at 230°C and subjected to gel permeation chromatography, a peak top molecular weight (A) measured by a differential refractive index detector and a peak top molecular weight (B) measured by an absorbance detector (measurement wavelength 280 nm) satisfy formula (1),
(A-B)/A<0.60 (1),
and absorbance at the peak top molecular weight (B) is 0.50×10-3 to 1.00×10-2. Accordingly, a polyvinyl acetal can be provided from which a film that has lower coloring due to heat and less foreign matters (undissolved fractions) can be obtained.
Inventors:
KUSUDOU TAKESHI (JP)
ASANUMA YOSHIAKI (JP)
FUJIOKA SHUNSUKE (JP)
TSUJI YOSHIHISA (JP)
ASANUMA YOSHIAKI (JP)
FUJIOKA SHUNSUKE (JP)
TSUJI YOSHIHISA (JP)
Application Number:
PCT/JP2013/071343
Publication Date:
February 12, 2015
Filing Date:
August 07, 2013
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
C08F8/28; C03C27/12; C08F16/38; C08K5/10; C08L29/14
Domestic Patent References:
| WO2011108152A1 | 2011-09-09 |
Foreign References:
| JP2011508802A | 2011-03-17 | |||
| JP2011241234A | 2011-12-01 | |||
| JP2005029764A | 2005-02-03 | |||
| JPH09316110A | 1997-12-09 | |||
| JPH1180272A | 1999-03-26 | |||
| JP2008214435A | 2008-09-18 | |||
| JPH0931124A | 1997-02-04 |
Attorney, Agent or Firm:
NAKATSUKASA, Shigeki et al. (JP)
Shigeki Nakamu (JP)
Shigeki Nakamu (JP)
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