Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2001-02-28
2003-03-11
Short, Patricia A. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S058000, C525S176000, C525S177000, C525S400000, C525S425000, C525S437000, C525S439000
Reexamination Certificate
active
06531548
ABSTRACT:
FIELD OF THE INVENTION
This invention concerns physical blends of poly(1,3-propylene 2,6-naphthalate) polymer compositions with other polymers in which the concentration of poly(1,3-propylene 2,6-naphthalate) is from 1 to 99 mole %.
TECHNICAL BACKGROUND OF THE INVENTION
This invention relates to blends of poly(1,3-propylene 2,6-naphthalate) polymers (referred to herein as 3GN polymers or 3GN) with other polymers.
U.S. Pat. No. 3,937,754 discloses a biaxially oriented polyethylene 2,6-naphthalate (PEN) film which comprises PEN containing no more than 10 mole % of non PEN forming components and 0.5 to 10% of a polyester containing at least 90 mole % of a homopolyester unit other than PEN, having a softening point at least 1° C. higher than its equilibrium softening point. Patentees teach that improvements in resistance to thermal degradation and Young's modulus are achieved after the softening point of the PEN resin has decreased and before it decreases to a point at least 1° C. higher than its equilibrium softening point. Thus, patentees teach that some, but not complete, reaction between the polyesters is necessary to achieve their desired advantages.
It is an object of the present invention to provide physical blends in which essentially no reaction between polymer components occur.
SUMMARY OF THE INVENTION
The present invention relates to compositions comprising physical blends of poly(1,3-propylene 2,6-naphthalate) polymer compositions with one or more second polymers in which the concentration of 3GN is from 1 to 99 mole % and in which essentially no reaction between the polymer components has taken place.
REFERENCES:
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patent: 5804626 (1998-09-01), Rogers et al.
patent: 5989665 (1999-11-01), Connell et al.
patent: 53-502570 (1978-05-01), None
patent: 5-287067 (1993-11-01), None
patent: 6-100767 (1994-04-01), None
Poly (Alkylene 2,6-Naphthalenedicarboxylate) Polyesters, Research Disclosure 28368, Nov. 1987.
Heffelfinger et al, X-Ray Determination of the Crystallite Orientation Distributions of Polyethylene Terephthalate Films, Journal of Polymer Science, 47, 289-306, 1960.
Leroy E. Alexander, X-Ray Diffraction Methods in Polymer Science, 206-209, 1969.
Wang et al, Dynamic Study of Crystallization- and Melting-Induced Phase Separatioin in PEEK/PEKK Blends, Macromolecules, 30, 4544-4550, 1997.
Smith et al, Preparation and Properties of Poly(Methylene terephthalates), Journal of Polymer Science, 4, 1851-1859, 1966.
E. I. Du Pont de Nemours and Company
Kuller Mark D.
Short Patricia A.
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