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08/17/06 - USPTO Class 264 | 38 views | #20060180956 | Prev - Next | About this Page

Dispersion stabilizer for suspension polymerization of vinyl compound and method of producing the same

Title: Dispersion stabilizer for suspension polymerization of vinyl compound and method of producing the same

Related Patent Categories: Plastic And Nonmetallic Article Shaping Or Treating: Processes, Miscellaneous

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20060180956, Dispersion stabilizer for suspension polymerization of vinyl compound and method of producing the same.

1. A dispersion stabilizer for use in suspension polymerization of a vinyl compound, the dispersion stabilizer comprising a vinyl alcohol polymer (A'), wherein in a 0.1-wt. % aqueous solution of the vinyl alcohol polymer (A'), a ratio (b)/(a) between absorbance (a) at a wavelength of 280 nm and absorbance (b) at a wavelength of 320 nm is at least 0.7, the 0.1-wt. % aqueous solution has a transmittance of at least 80% at a wavelength of 500 nm, at 30.degree. C., and a 1-wt. % aqueous solution of the vinyl alcohol polymer (A') has a yellow index (YI) of 40 or lower.

2. The dispersion stabilizer according to claim 1, wherein a residual acetic acid group of the vinyl alcohol polymer (A') has a block character of at least 0.35.

3. The dispersion stabilizer according to claim 1, wherein a residual acetic acid group of the vinyl alcohol polymer (A') has a block character of at least 0.37.

4. The dispersion stabilizer according to claim 1, wherein a residual acetic acid group of the vinyl alcohol polymer (A') has a block character of at least 0.4.

5. The dispersion stabilizer according to claim 1, wherein a ratio Mw/Mn between weight-average molecular weight Mw and number-average molecular weight Mn of the vinyl alcohol polymer (A') is in a range 2.1 to 4.9.

6. The dispersion stabilizer according to claim 1, wherein the ratio Mw/Mn, of weight-average molecular weight Mw to number-average molecular weight Mn, of the vinyl alcohol polymer (A') is in a range 2.2 to 4.7.

7. The dispersion stabilizer according to claim 1, wherein the ratio Mw/Mn, of weight-average molecular weight Mw to number-average molecular weight Mn, of the vinyl alcohol polymer (A') is in a range 2.2 to 4.4.

8. The dispersion stabilizer according to claim 1, wherein the ratio (b)/(a) between the absorbance (b) and the absorbance (a) is in the range of 0.7 to 1.5.

9. The dispersion stabilizer according to claim 1, wherein the absorbance (a) at a wavelength of 280 nm of the 0.1-wt. % aqueous solution of the vinyl alcohol polymer (A') is at least 0.1.

10. The dispersion stabilizer according to claim 1, wherein the absorbance (a) at a wavelength of 280 nm of the 0.1-wt. % aqueous solution of the vinyl alcohol polymer (A') is at least 0.2.

11. The dispersion stabilizer according to claim 1, wherein the absorbance (a) at a wavelength of 280 nm of the 0.1-wt. % aqueous solution of the vinyl alcohol polymer (A') is at least 0.25.

12. The dispersion stabilizer according to claim 1, wherein the YI of the 1-wt. % aqueous solution of the vinyl alcohol polymer (A') is 35 or lower.

13. The dispersion stabilizer according to claim 1, wherein the YI of the 1-wt. % aqueous solution of the vinyl alcohol polymer (A') is 30 or lower.

14. The dispersion stabilizer according to claim 1, wherein the 0.1-wt. % aqueous solution of the vinyl alcohol polymer (A') has a transmittance of at least 82% at a wavelength of 500 nm, at 30.degree. C.

15. The dispersion stabilizer according to claim 1, wherein the 0.1-wt. % aqueous solution of the vinyl alcohol polymer (A') has a transmittance of at least 85% at a wavelength of 500 nm, at 30.degree. C.

Brief Patent Description - Full Patent Description - Patent Claims

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