DE1544770A1 - Molding compounds with increased impact strength based on polyvinyl chloride or its copolymers - Google Patents

Description

Troisdorf,: 7.1.1965-

DYIMIT PLANE JU ^ IEMESELLSCHAi ¹ T

15U77Q

Troisdorf / District Cologne

Molding compounds with increased impact resistance on the basis of Polyvinyl chloride or its Uig copolymers

It is known that the addition of copolymers of the Ethylene with vinyl acetate to polyvinyl chloride molding compounds improved Impact resistance can be obtained, but the disadvantage is that this requires high percentages are, and numerous other mechanical properties of the molding compounds obtained by such additives, such as the stiffness, in undesirable 'Jeise / change'

It is therefore of great technical interest, even by means of low additions to obtain products with high U-notch toughness, while maintaining their other mechanical properties. , '

It has now been found that 'one can even with small additions can achieve high U-notch toughness compared to polyvinyl chloride if this additive according to the present invention from a cross-linked Misohpoylmerisat of ethylene with vinyl acetate besides, with a deterioration in other mechanical properties is avoided wirä. The networking takes place in a manner known per se, for example with peroxides such as dicumyl peroxide or the like., or by irradiation. Additions of triallyl cyanurate can be an advantage here, It is advisable to

-2 -

SAD 909832/129 3

To add stearic acid to the copolymers when incorporating peroxides on the roller, to avoid sticking. Crosslinking takes place at temperatures of about 120 ° C. to about 110 ° C., depending on the intended use. According to the present invention, Dian advantageously uses such crosslinked copolymers of ethylene with vinyl acetate which, before crosslinking, have a content of about 10% by weight to about 90% by weight of vinyl acetate and relative viscosities of about 1.5 to 5 % (measured in chloroform at 20 ° C.) " by variation of temperature ^and: etching the production of products of different degree of crosslinking such that the molding compositions can be prepared in association with an alternating vinyl acetate content in the crosslinked copolymer, which can be adapted largely eck their Verwendungsz7 /.

The molding compositions prepared according to the invention can optionally Stabilizers, lubricants, plasticizers and / or other high-polymer compounds can be added copolymers of vinyl chloride can also be used instead of the homopolymer. For example, copolymers of vinyl chloride with vinyl acetate, vinyl propionate, vinyl stearate, vinylidene chloride, acrylic acid ester, itaconic acid ester, acrylonitrile, Maleic acid ester, fumaric acid ester and the like can be used. Copolymers of vinyl chloride can also be used with advantage use in combination with the homopolymer. Suitable copolymers are, for example, copolymers of

co vinyl chloride with ethylene, propylene or other olefins. Ό

It was found that even low levels of crosslinked mixed > ^ polymers of ethylene with vinyl acetate in polyvinyl chloride (o or its copolymers a substantial increase in

** ^> cause impact resistance. This improves the impact resistance

- 3 - 'SAD ORIGINAL

with a content of about 0.5 wt% / fc of crosslinked copolymer, without the other mechanical properties of the molding compounds deteriorating, while at contents of about 2 wt% to about 10% by weight optimum values between the impact strength and, for example, the tensile strength can be achieved. Examples

1. 50 parts of a copolymer of 55 wt .- ^ o ethylene with

45% by weight of vinyl acetate, 1 part of cumyl peroxide and 1 part of stearic acid are on the 7 / alze 20 minutes at a temperature of 90 ° G rolled. The Jalzfell is pressed into a sheet for 10 minutes at a temperature of 135 ° C. In contrast to the uncrosslinked starting material is the crosslinked product obtained only swellable in chloroform.

2.600 parts of suspension polyvinylchloride (Κ-7 / ert 70), Η parts of dibutyltin di (octylacetomercaptide) formula (.G.Hq) ^ SnCSCII ₂ GOOGLE ₈ as a stabilizer and 3.5 parts of low molecular weight Hochdruckpolyäthylens (average molecular weight == ü.OOO) as a lubricant are shown together with 4I ö ^r in the above-described 'Jeise crosslinked product at a temperature of 170 ⁰ C for 20 minutes-rolled. The still hot rolled sheet is then pressed into a plate.

The following table provides a comparison of the U-notch toughness crosslinked and non-crosslinked molding compounds again. Tabel

O CO OO Ca>

Content of the polyvinyl chloride molding compounds
of ethylene / vinyl acetate copolymers from
Weight ratio 5.5 to 4.5 ■ U-notch toughness
(cm.Kp/cia^) not networked 0.9 Qevi.-fo
3.0
5.0 »
5.7
7.5 "
- 4 - networked 3.4.
6.2
10.2
11.0
13.4 8.6
30.5
58.0
64.3
78.1

Claims (2)

Claim . l ^? oriiiiiiassen with increased 3chl '\ gfeati ^ xeit on the basis of. Polyvinyl chloride or its copolymers containing copolymers of ethylene with vinyl acetate, characterized in that the copolymers of ethylene and about 10 pieces. -fa to about 90 Uow. - ^u / o vinyl acetate is crosslinked, 2. Molding compositions according to claim 1, characterized in that the Content of. crosslinked copolymer of ethylene and vinyl acetate about 0.5 to about 10 wt .- ^ o, based on polyvinyl chloride or its copolymers, is » 909832/1293