Process for preparing polybutene compositions having increased crystallization temperature
AssigneeBasell Poliolefine Italia S.r.l.
InventorsMichele Grazzi, Roberta Marchini
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Abstract
A process for producing a polybutene-1 composition including the step of: blending A) from 99.5 to 99.9% by weight, with respect to the total weight of A)+B), of a butene-1 polymer which is brought to a molten state or maintained in a molten state during the blending step; and B) from 0.1 to 0.5% by weight, with respect to the total weight of A)+B), of an alkanoyl hydrazine; wherein the resulting polybutene-1 composition, having a crystallization temperature TcC satisfying the following relation: T c C ≥ T c A + 5 where TcA is the crystallization temperature of the butene-1 polymer A).
Claims14
A process for producing a polybutene-1 composition, comprising the step of:
- blending
- A) from 99.5 to 99.9% by weight, with respect to the total weight of A)+B), of a butene-1 polymer selected from the group consisting of butene-1 homopolymers, butene-1 copolymers, and mixtures thereof, wherein the butene-1 polymer being brought to a molten state or maintained in a molten state during the blending step;
- and
- B) from 0.1 to 0.5% by weight, with respect to the total weight of A)+B), of an alkanoyl hydrazine of formula (I):
- wherein R1 is an alkyl group containing from 1 to 6 carbon atoms, R2 is hydrogen or an alkyl group containing from 1 to 6 carbon atoms, and n is an integer number from 0 to 5;
- wherein the resulting polybutene-1 composition, having a crystallization temperature TcC satisfying the following relation:
- T
- c
- C
- ≥
- T
- c
- A
- +
- 5
- ;
- where TA and TcC are expressed in ° C., TcA is the crystallization temperature of the butene-1 polymer A), and crystallization temperatures being determined by differential scanning calorimetry (DSC), with a heating and cooling rate of 10° C./minute.
A polybutene-1 composition comprising:
- A) from 99.5 to 99.9% by weight, with respect to the total weight of A)+B), of a butene-1 polymer selected from the group consisting of butene-1 homopolymers, butene-1 copolymers, and mixtures thereof, wherein the butene-1 polymer having crystallization temperature TcA equal to or higher than 60° C.;
- and
- B) from 0.1 to 0.5% by weight, with respect to the total weight of A)+B), of an alkanoyl hydrazine of formula (I):
- wherein R1 is an alkyl group containing from 1 to 6 carbon atoms, R2 is hydrogen or an alkyl group containing from 1 to 6 carbon atoms, and n is an integer number from 0 to 5;
- wherein the polybutene-1 composition having a crystallization temperature TcC satisfying the following relation:
- T
- c
- C
- ≥
- T
- c
- A
- +
- 5
- ;
- where TcA and TcC are expressed in ° C., TcA is the crystallization temperature of the butene-1 polymer A) and crystallization temperatures TcA and TcC being determined by differential scanning calorimetry (DSC), with a heating and cooling rate of 10° C./minute.
Dependencies are inferred from the claim text.