Multilayer polymer structure

Details Multilayer polymer structure Multilayer polymer structure

2011-06-14

2011-06-14

Zacharia, Ramsey (Department: 1787)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S421000, C428S474400, C156S244110

Reexamination Certificate

active

07960014

ABSTRACT:
Multilayer Polymer Structure Multilayer structure comprising at least one couple (L1-L2) of adjacent layers (L1) and (L2), wherein layer (L1) comprises at least one polymer composition (C1) comprising a grafted fluoropolymer material (M1) consisting of N1 grafted fluoropolymer(s) (P1), said polymer(s) (P1) obtained by a process comprising grafting onto an ungrafted fluoropolymer (U1) at least one grafting agent (G1) chosen from ethylenically unsaturated carboxy acids, their esters, their anhydrides and their salts, layer (L2) comprises at least one polymer composition (C2) comprising at least one impact modifier (I2) and a semi-crystalline aromatic polyamide material (M2) consisting of N2 semi-crystalline aromatic polyamide polymer(s) (P2), and the average melting temperature (Tav,1) of material (M1) differs by at most 45° C. from the average melting temperature (Tav,2) of material (M2), Njbeing the number of polymer(s) (Pj) of material (Mj), Nj>1, Tav,jbeing equal to formula (T) wi,jbeing the weight amount of the ithpolymer (Pj) of material (Mj), Ti,jbeing the melting temperature of the ithpolymer (Pj) of material (Mj), Wjbeing the total weight amount of material (Mj), for j=1 and for j=2. Process for manufacturing the above multilayer structure, which comprises co-extruding polymer compositions (C1) and (C2), so as to obtain couple (L1-L2) of adjacent layers (T1) and (T2). Shaped article comprising the above multilayer structure, and process for manufacturing it.(∑i=1Nj⁢wi,j⁢Ti,j)/Wj(1)

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