Polymeric materials

1. A composition comprising:

a polymeric material (A) having a repeat unit of formula

—(O-Ph)n-O-Ph-O-Ph-CO-Ph-  I

and a repeat unit of formula

—O-Ph-Ph-O-Ph-CO-Ph-  II

wherein Ph represents a phenylene moiety and n represents 0; and

(ii) a polymeric additive, wherein said polymeric additive is:

(b) a polymeric material (B) which includes a first and a second repeat unit of general formula

wherein R 1 and R 2 independently represent a hydrogen atom or an optionally-substituted alkyl group, and R 3 and R 4 independently represent a hydrogen atom or an optionally-substituted alkyl group, an anhydride-containing moiety or an alkyloxycarbonyl-containing moiety, wherein said first repeat unit of general formula III comprises:

and said second repeat unit of general formula III comprises:

and

wherein the composition has a notched izod impact strength of at least 6.0 KJm −2 .

2. A composition according to claim 1 , wherein said repeat units I and II are in the relative molar proportions I:II of from 65:35 to 95:5.

3. A composition according to claim 1 , wherein said repeat unit of formula I has the structure

and

said repeat unit of formula II suitably has the structure

4. A composition according to claim 3 , wherein said polymeric material (A) includes at least 65 mol % of repeat units of formula IV and includes less than 90 mol % of repeat units of formula IV, and wherein said polymeric material (A) includes at least 10 mol % of repeat units of formula V; and less than 36 mol % of repeat units of formula V.

5. A composition according to claim 1 , wherein the Tm of said polymeric material (A) is less than 330° C.

6. A composition according to claim 1 , wherein said polymeric material (A) has a crystallinity of at least 23%.

7. A composition according to claim 1 , wherein said polymeric material (A) has a melt viscosity of at least 170 Pa·s.

8. A composition according to claim 1 , wherein said polymeric additive has a softening point of at least 100° C.

9. A composition according to claim 1 , wherein said polymeric additive has a decomposition temperature measured by thermogravimetric analysis of less than 400° C.

10. A composition according to claim 1 , wherein said composition has a melt viscosity of less than 225 Pa·s.

11. A composition according to claim 1 , wherein said composition has an L* of at least 75; and the ratio of the L* of said composition divided by the L* of said polymeric material (A) is at least 1.05.

12. The composition according to claim 1 , wherein the composition has a notched izod impact strength of 6.0 to 13.5 KJm −2 .

13. A method of making a composition according to claim 1 , the method comprising:

(a) selecting a polymeric material according to claim 1 ;

(b) selecting a polymeric additive according to claim 1 ;

(c) melt-processing the polymeric material and polymeric additive in a melt-processing apparatus, thereby to produce said composition wherein, suitably, said polymeric material (A) and said polymeric additive are intimately mixed.

14. A method according to claim 13 , wherein the polymeric additive is not subjected to a temperature which is greater than 330° C. in the process.

15. A method according to claim 13 , which comprises making a composition which has an increased L* compared to the L* of said polymeric material (A), and/or making a composition which has an L* of at least 75.