Claims
- 1. A polymeric blend having a high impact resistance, a high degree of flexibility and a good resistance to wear, consisting essentially of:
- (1) from 10% to 90% by weight of a thermoplastic polyurethane having a hardness between 60 Shore A and 80 Shore D; and
- (2) from 90% to 10% by weight of a compatibilizing agent comprising of a vinyl-aromatic copolymer containing copolymerized in the polymer chain from 2% to below 15% by weight of an ethylenically unsaturated nitrile and not greater than 15% by weight of a rubber; and
- (3) from 0% to 80% by weight of a vinyl-aromatic polymer containing at least 50% by weight of one or more vinyl-aromatic monomers of the formula (I): ##STR2## wherein X is hydrogen or an alkyl with 1 to 4 carbon atoms; ;Y is a halogen or an alkyl with 1 to 4 carbons atoms; and n is zero or an integer from 1 to 5; with the proviso that the vinyl-aromatic polymer (3) does not contain an ethylenically unsaturated nitrile unit.
- 2. A polymeric blend according to claim 1, consisting essentially of from 10% to 50% by weight of said thermoplastic polyurethane and from 80% to 10% by weight of said vinyl-aromatic copolymer containing at least 2% but less than 15% by weight of an ethylenically unsaturated nitrile and not greater than 15% by weight of a rubber.
- 3. A polymeric blend according to claim 1, consisting essentially of at least 10% by weight of said vinyl-aromatic copolymer containing at least 2% but less than 15% by weight of an ethylenically unsaturated nitrile and not greater than 15% by weight of a rubber, the remainder of the blend consisting of a mixture of said thermoplastic polyurethane and said vinyl-aromatic polymer.
- 4. A polymeric blend according to claim 1, wherein the ethylenically unsaturated nitrile is acrylonitrile.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 19553 A/85 |
Feb 1985 |
ITX |
|
Parent Case Info
This application is a Continuation of application Ser. No. 119,280, filed Nov. 9, 1987, which is a Continuation of application Ser. No. 830,124, filed Dec. 18, 1986, now both abandoned.
1. Field of the invention.
The present invention relates to polymeric blends based on vinyl-aromatic polymers having a high impact resistance. More particularly, the present invention relates to polymeric blends based on vinyl-aromatic polymers having a high impact resistance, a high degree of flexibility and a good resistance to wear.
2. Description of the Prior Art.
As known, the vinyl-aromatic polymers are thermoplastic resins suitable to be transformed into shaped bodies by injection or extrusion molding. Said vinyl-aromatic polymers have a fair tenacity but they are not suitable for use in applications where a high impact resistance, a high degree of flexibility and a good resistance to wear are required.
Our particularly appealing route to improve the properties of the vinyl-aromatic polymers is through blending said vinyl-aromatic polymers with other polymers having the lacking properties to give a material with the desired combination of properties. This approach has been successful only in a limited number of cases. In fact, it has often been found that such blending results in combining the worst features of each component with the result being a material of such poor properties as not to be of any practical or commercial value.
The reasons for this failure are rather well understood and are due in part to the fact that not all the polymers are compatible with each other, and therefore do not perfectly adhere. As a result, interfaces are formed between the components of the blend and represent areas of severe weakness and breaking points.
Thus, for instance, the blending of a vinyl-aromatic polymer with a thermoplastic polyurethane, in order to improve the impact resistance, flexibility and wear resistance, did not yield satisfactory results. As a matter of fact, the shaped products obtained from such blend show poor physical-mechanical properties and delaminate superficially owing to the incompatibility of the two polymers.
US Referenced Citations (1)
| Number |
Name |
Date |
Kind |
| 3970717 |
Muller-Albrecht |
Jul 1976 |
|
Foreign Referenced Citations (1)
| Number |
Date |
Country |
| 0012343 |
Jun 1980 |
EPX |
Continuations (2)
|
Number |
Date |
Country |
| Parent |
119280 |
Nov 1987 |
|
| Parent |
830124 |
Dec 1986 |
|
Patent Grant
4980417
