β Crystalline polypropylenes

Details β Crystalline polypropylenes β Crystalline polypropylenes

2003-05-22

2008-09-09

Nutter, Nathan M (Department: 1796)

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

Synthetic resins

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

C525S194000

Reexamination Certificate

active

07423088

ABSTRACT:
A composition containing (1) a crystalline polypropylene resin and (2) one or more β-nucleating agents of the formula (I), wherein R1, R2and R3, independently of one another, are C1-C20alkyl, C2-Calkyl substituted by C1-C10alkylamino, di(C1-C10alkyl)amino, C1-C10alkyloxy or hydroxy; C3-C20alkenyl, C5-C12cycloalkyl, C5-C12Cycloalkyl substituted by 1, 2 or 3 C1-C10alkyl; cyclohexylmethyl; cyclohexylmethyl substituted by 1, 2 or 3 C1-C10alkyl; C5-C9cycloalkenyl, C5-C9cycloalkenyl substituted by 1, 2 or 3 C1-C10alkyl; phenyl substituted by 1, 2 or 3 radicals selected from the group consisting of C1-C10-oalkyl, C1-C10alkyloxy, hydroxy, halogen, trihalogenmethyl, trihalogenmethoxy, benzoyl, phenylamino, acylamino and phenylazo; C7-C9phenylalkyl, C7-C9phenylalkyl which is substituted on the phenyl by 1, 2 or 3 radicals selected from the group consisting of C1-C10alkyl, C1-C10alkoxy and hydroxy; naphthyl, naphthyl substituted by C1C10alkyl, adamantyl, or a 5 to 6 membered heterocyclic group; characterized in that the polypropylene resin has a content of β-form crystals of at least 10% calculated by means of the following equation β-form crystal content (%)=100×Pβ1,/(Pa1+Pa2+Pa3+Pβ1) where Pa1to Pa3are respective peak heights (maxima) of the a-form and Pβ1is a peak height (maximum) of the β-form determined by wide angle X-ray scattering.

REFERENCES:
patent: 6235823 (2001-05-01), Ikeda et al.
patent: 7235191 (2007-06-01), Schmidt et al.
patent: 2004/0063830 (2004-04-01), Schmidt et al.

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