Butene-1 polymer composition having a high melt flow rate

Patent metadata

Field	Value
Publication number	US-10894850-B2
Application number	US-201716312474-A
Country	US
Kind code	B2
Filing date	Jul 3, 2017
Priority date	Jul 7, 2016
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A butene-1 polymer composition having MFR values of from 400 to 2000 g/10 min, measured according to ISO 1133 at 190° C. with a load of 2.16 kg, made from or containing
A) a butene-1 homopolymer or a copolymer of butene-1 with a comonomer selected from the group consisting of ethylene and higher alpha-olefins, having a copolymerized comonomer content of up to 5% by mole; B) a copolymer of butene-1 with a comonomer selected from the group consisting of ethylene and higher alpha-olefins, having a copolymerized comonomer content of from 6% to 20% by mole;

wherein the composition having a total copolymerized comonomer content from 4% to 15% by mole, referred to the sum of A) and B), and a content of fraction soluble in xylene at 0° C. of 60% by weight or less, determined on the total weight of A) and B).

First claim

What is claimed is:

1. A butene-1 polymer composition comprising:
A) a butene-1 homopolymer or a copolymer of butene-1 with a comonomer selected from the group consisting of ethylene and higher alpha-olefins, having a copolymerized comonomer content (C A ) of up to 5% by mole; and
B) a copolymer of butene-1 with a comonomer selected from the group consisting of ethylene and higher alpha-olefins, having a copolymerized comonomer content (C B ) of from 6% to 20% by mole;

wherein the composition has a MFR from 400 to 2000 g/10 min, measured according to ISO 1133 at 190° C. with a load of 2.16 kg, and has an intrinsic viscosity, measured in tetrahydronaphthalene at 135° C., of lower than 0.6 dl/g,
wherein the composition has a total copolymerized comonomer content from 4% to 15% by mole referred to the sum of A) and B), and has a content of fraction soluble in xylene at 0° C. of 60% by weight or less determined on the total weight of A) and B).

2. The butene-1 polymer composition of claim 1 , comprising:
35% to 65% by weight of A) and
35% to 65% by weight of B),
referred to the total weight of A) and B).

3. The butene-1 polymer composition of claim 1 , having a DH TmII from 9 to 20 J/g, measured with a scanning speed corresponding to 10° C./min.

4. The butene-1 polymer composition of claim 1 , having a Brookfield viscosity of from 5,000 to 50,000 mPa·sec, measured at 180° C. and a deformation rate of 100 s −1 .

5. The butene-1 polymer composition of claim 1 , having a Mw/Mn value, where Mw is the weight average molar mass and Mn is the number average molar mass, both measured by GPC, equal to or lower than 4.

6. The butene-1 polymer composition of claim 1 , having a Mw value equal to or greater than 30.000.

7. The butene-1 polymer composition of claim 1 , having a glass transition temperature of −22° C. or less.

8. The butene-1 polymer composition of claim 1 , having a yellowness index lower than 0.

9. A process for preparing the butene-1 polymer composition of claim 1 , comprising:
at least two sequential stages, carried out in two or more reactors connected in series,
wherein components A) and B) are prepared in separate subsequent stages, operating in each stage, except the first stage, in the presence of the polymer formed and the catalyst used in the preceding stage.

10. The process of claim 9 , carried out in the presence of a metallocene catalyst obtainable by contacting:
a stereorigid metallocene compound;
an alumoxane or a compound capable of forming an alkyl metallocene cation; and, optionally,
an organo aluminum compound.

11. A hot-melt adhesive composition comprising:
the butene-1 polymer composition of claim 1 .

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Marchini Roberta
• Spataro Stefano
• Burgin Emanuele
• Pica Roberta

Classifications

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C09J123/20 Primary

  having four to nine carbon atoms · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F210/08 Primary

  Butenes · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title