DE1694654A1 - Polymer mass - Google Patents

Description

, Dec. 1967

HAMBURG MTENTAMWitTE 1694654

W. 1339V67 9 / gw

MOBIL OIL COHPOEAiDIOlT New Xörk, N. Y. (V.St. A.)

Polymer mass

The invention relates to polymers and interpolymers of butene-1 and in particular an improvement in the low temperature properties and processability of such polymers and copolymers

Polymers and copolymers based on butene-1, ie, polybutene-1 and copolymers of butene-1 with other 1-olefins consisting predominantly of butene-1 "have a number of desirable properties including good stress cracking resistance, toughness and good Electrical properties. The brittle temperature of these polymers and copolymers is generally from about ^{0 0} G to -20 ⁰ G (ASTM test D746-57I). however, a lower brittleness temperature is desirable.

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■ ■■■■ .. ■■;. ■. - 2 -

wisely, the lower brittleness temperature should be without substantial Loss of the other properties of the polymers can be achieved.

The low temperature properties of resins Butene-1 bases can be improved by a number of methods, for example by copolymerization with ethylene · However, this method leads to a partial loss of other desirable properties of the resin and is therefore not useful for many applications.

It has now been found that the brittleness temperature of butene-1 polymers and copolymers is only slightly Loss of other properties can be reduced. It was found that the brittleness temperatures of such polymers and copolymers can be reduced by incorporating an ethylene-propylene elastomer can.

According to the invention, a polymer composition is then provided which comprises a polymer based on butene-1 and 5 to 25%, based on the weight of the polymer composition, of an ethylene-propylene elastomer.

In the case of the polymers produced by incorporation of the Elastomers can be improved, they are polymers and copolymers based on butene-1. For simplification the term "butene-1-based polymers" is used throughout and this term is intended crystalline polybutene-1 homopolymers and crystalline regular

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Loose or random interpolymers of butene-1 and another 1-01 efin, the content of other 1-olefin in the interpolymer not exceeding 20 mol%. Olefins which can be copolymerized with butene-1 are in particular ethylene, propylene, pentene-1, k- methylpentene-1, 3-methylbutene-1 and hexene-1. The polymers based on butene-1 can be prepared in a known manner using conventional Ziegler-Kfatta polymerization methods.

In the case of the materials used in the butene-1-based polymers to lower the brittleness temperatures are incorporated, they are ethylene-propylene elastomers. In this document, the term "ethylene propylene elastomer" refers to atactic Mixed polymers of ethylene and propylene and ethylene-propylene terpolymers, in which the third monomer is a diolefin. These copolymers and terpolymers are used according to the conventional Ziegler-Hatta polymerization methods for production made from atactic polymers. The ethylene-propylene copolymers generally contain between about 40 and about 60% by weight of ethylene · The ethylene-propylene terpolymers are similar to the copolymers, except that they are still between about 1 and about 3 wt .-% of a diolefin. The diolefin can be an open chain diolefin or a cyclic * Diolefin act * Typical diolefins with ethylene and

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Propylene are terpolymerized are butadiene-1,2, butadiene-1,3, Isoprene, cyclopentadiene, dicyclopentadiene and substituted cyclo- and dicyclopentadienes. The ethylene propylene elastomers are known and commercially available.

The amount of ethylene-propylene-elastomer which is incorporated into the polymers based on butene-1 is, according to the invention, 5 to 25 % based on the weight of the total mass, since then the best matching of the properties of the polymer mass is achieved will. The incorporation can easily take place in the course of usual processing measures, such as extrusion, mixing, plasticizing, or during the EPT or EPE polymerization process, whereby the butene polymer can be added in solution (e.g. in hexane or heptane) and both polymers can be removed upon completion of the polymerization reaction the solution will be precipitated.

The invention is illustrated below by way of examples further illustrated, but it is not limited to these particular implementations.

Examples 1-6

There were various weight percentages of three ethylene-propylene elastomers with the in Table I specified properties in proportions of a crystalline Polybutene-1 incorporated. In each case, pellets were made from Polybutene-1 was physically mixed with the elastomer and then the mixture was extruded three times to be uniform Ensure mixing. Relevant data for

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each mixture and for the polybutene-1 are in the table II stated.

Table I Ethylene Propylene Elastomers

A B 0

JLthylen wt -.% 40-46 50-60 51-61

Dicyclopentadiene wt -.% - 2.6 3.3

Mooney viscosity

ml (1 + 8 min) at 127 ⁰ O

C260OF) 35-45 57-67 35-45

Specific gravity 0.86 0.86 0.86

Table II

Physical properties

Yield strength, kg / cm (Xield strength, psi)

Breaking Strength, kg / cm (Break strength, psi)

Elongation at break, % (Break elongation)

Tensile modulus, psi Density, g / cnr melting point, ⁰ C brittleness ^{temp., 0} C melt index, g / 10 min

Homopolymer Uk 10 % Uk 10 % Uk 10 % 138.5
(1970) 105.5
(1500) * 89.3
(1270) 107.2
(1525) 116
(1650) 114.2
(1625) 60.5
(860) 383
(5440) 347
(4940) 316
(4500) 323
(4600) 351
(5000) 292
(4160) 314
(4465) 290 295 305 320 310 250 260 2770
(39,400) 2480
(35,300) 1975
(28,100) 2480
(35,300) 2430
(34,600) 2320
(33,000) 1660 '
(23,600) 0.912 0.908 0.903 0.902 0.907 0.903 0.900 126 128 129 127 127 127 127 -19 -29 -29 -30 -30 -29 -37 0.24 0.29 0.27 0.27 0.26 0.29 0.27 σ>
co
j> »
CD
Oil
J> - Ϊ

- 7 - Examples 7-13

Using the working methods of Examples 1-6, blends of butene-1-propylene copolymer and ethylene-propylene elastomers were prepared. The butene-propylene copolymer contained about 16 mole percent propylene (about 8 percent in the polymerization charge). Relevant data are given in Table III.

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Table III

O CO OO

Physical properties

Yield strength, kg / cm (psi)

Breaking strength, kg / cm (Break strength, psi) Elongation at break, % (Break elongation) Tensile modulus, kg / cm ' (tensile modulus, psi) Density, g / cm Melting point, ⁰ C brittleness temperature, melt index, g / 10 min

Butene-propylene copolymer

105.5 (1500)

351 (5000)

290

1900 (27,000)

0.903

118

-18

0.20

107.2 (1525)

358 (5100)

295

2,320 (33,000)

0.902

119

-34

0.20

86.1
(1225)

351
(5000)

103.7
(1475)

380
(5400)

340
2640

94.8
(1350)

380
(5400)

350
1560

10 ,;

116 109 (1650) (1550)

313 358 (4450) (5100)

350 360

2640

2560

77.3 (1100)

(4475) 340

1510 «

(29.5ΟΟ) (37.5ΟΟ) (22,200) (37,600) (36,400) (21,500) 0.898 0.901 0.900 0.903 0.902 0.895 119 119 119 118 118 118 -40 -33 -37 -30 -37 <-50

0.20 0.16 0.27 0.13 0.16 0.13

cn

-cn ι

Claims (2)

Claims 1. Polymer composition comprising a polymer based on butene-1, characterized in that that they are 5 to 25% by weight based on weight the polymer mass, an ethylene-propylene elastomer contains. 2. polymer composition according to claim 1, characterized characterized in that the ethylene-propylene elastomer from an atactic copolymer of ethylene and propylene or from an atactic one Terpolymer is made up of ethylene, propylene and dicyclopentadiene. 109829/1745