Propylene polymer particle method of producing the same and...

Details Propylene polymer particle method of producing the same and... Propylene polymer particle method of producing the same and...

2008-07-22

2008-07-22

Lu, Caixia (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S142000, C526S160000, C526S165000, C526S943000, C502S103000, C502S120000, C502S126000, C502S152000, C428S407000

Reexamination Certificate

active

07402638

ABSTRACT:
The present invention relates to a propylene random copolymer which satisfies the following requirements [1] to [4], and to various useful molded products obtained by molding the propylene random copolymer:[1] the concentration (Pa, % by mole) of a skeletal constituent derived from propylene (a), and the concentration (Px, % by mole) of a skeletal constituent derived from at least one olefin selected from ethylene (b) and α-olefins having 4 to 20 carbon atoms (c), each of which is contained in the propylene random copolymer, satisfy the following relational expressions (Eq-1) to (Eq-3):in-line-formulae description="In-line Formulae" end="lead"?85≦Pa<100  (Eq-1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0<Px≦15  (Eq-2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Pa+Px=100;  (Eq-3)in-line-formulae description="In-line Formulae" end="tail"?[2] the concentration (Pa, % by mole) of the skeletal constituent derived from propylene (a) contained in the propylene random copolymer, and the melting point (Tm) measured with a differential scanning calorimeter satisfy the following relational expression (Eq-4):in-line-formulae description="In-line Formulae" end="lead"?135−4×(100−Pa)<Tm<165−4×(100−Pa);  (Eq-4)in-line-formulae description="In-line Formulae" end="tail"?[3] the total amount of 2,1-bonded and 1,3-bonded non-stereoregular fractions is less than or equal to 0.2% by mole; and[4] the amount of the n-decane (nC10)-soluble fraction is less than or equal to 2.0% by weight.

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