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1. WO2000037557 - COMPOSITION POLYMERE DE PROTECTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS :

1. A capstock polymer composition comprising a blend of:
a melt extrudable acrylic polymer component;
from 10% to 50% by weight of the composition of a halogen donor component;
an effective amount of a halogen volatilisation agent; and
a char-inducing component which induces formation of a char upon application of flame to the composition.

2. A capstock polymer composition according to claim 1, wherein the acrylic polymer component comprises from 40 to 75% by weight of the composition.

3. A capstock polymer composition according to claim 1 or claim 2, wherein the acrylic polymer component comprises at least a major amount of a high molecular weight acrylic polymer that has a molecular weight of from about 100,000 to about 500,000.

4. A capstock polymer composition according to claim 3, wherein the acrylic polymer component comprises more than 50% by weight, based on the weight of the acrylic component, of a high molecular -weight acrylic polymer having a molecular weight m the range of from about 150,000 to about 350,000, on a number average basis, and up to 50% by weight, based on the weight of the acrylic polymer component, of a low molecular weight acrylic polymer having a molecular weight of from about 10,000 to about 100,000, on a number average basis.

5. A capstock polymer composition according to any one of claims 1 to 4, further comprising a pigment for imparting colour to the material.

6. A capstock polymer composition according to any one of claims 1 to 5, wherein the halogen donor component comprises a halogen-containing polymer which has a K value of from about 50 to about 65.

7. A capstock polymer composition according to any one of claims 1 to 6, wherein the halogen donor component comprises polyvmyl chloride.

8. A capstock polymer composition according to any one of claims 1 to 7, wherein the char-inducing component comprises a blend of vitreous materials which exhibits a broad melting range of from about 350°C up to about 800°C and which
devitrifies at temperatures in the range of from about 800° to about 900°C.

9. A capstock polymer composition according to any one of claims 1 to 7, wherein the char-inducing component comprises zinc borate, zinc stannate, or a mixture thereof.

10. A capstock polymer composition according to any one of claims 1 to 9, wherein the amount of the char-inducing
component ranges from about 2% by weight up to about 15% by weight of the composition.

11. A capstock polymer composition according to any one of claims 1 to 10, comprising a blend of:
from 40 to 75% by weight of the composition of a melt extrudable acrylic polymer component;
from 10% to 30% by weight of the composition of a polvvmvl chloride which has a K value of from about 50 to about 65 as a halogen donor component;
from 3% to 8% by weight of the composition of sodium antimonate or antimony trioxide as a halogen volatilisation agent; and
from 2% to 15% by weight of the composition of at least 5 one zmc salt selected from z c stannate and zinc borate as a char-mducmg component.

12. A polymer laminate comprising a base material and a coat of a capstock polymer composition according to any one of

10 claims 1 to 11.

13. A polymer laminate according to claim 12, wherein the coat has a thickness of from about 40 μm to about 500 μm.

15 14. A polymer laminate according to claim 12 or claim 13, wherein the base material comprises polyvmyl chloride.