Process for preparing vinylidene fluoride homopolymer having...

Details Process for preparing vinylidene fluoride homopolymer having... Process for preparing vinylidene fluoride homopolymer having...

2011-06-28

2011-06-28

Nutter, Nathan M (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S240000, C427S352000, C427S372200

Reexamination Certificate

active

07968649

ABSTRACT:
The present invention provides a process for easily preparing a vinylidene fluoride homopolymer comprising an I-form crystal structure at high purity by selecting a solvent, and the process for preparing the vinylidene fluoride homopolymer comprises not less than 70% by mass of I-form crystal structure, which is obtained by dissolving a vinylidene fluoride homopolymer having a number average degree of polymerization of 3 to 20 in a solvent consisting of an organic solvent having a dipole moment of not less than 2.8 alone or comprising the organic solvent in a part, thereafter, evaporating the solvent.

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Herman et al: “Chain Length Effects on Crystal Formation in Vinylidene Fluoride Oligomers” Polymer Journal, Society of Polymer Science, Tokyo, Japan, vol. 30, No. 9, Aug. 1, 1999, pp. 659-663, XP009116017.

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