Binder based on carboxylic acid vinyl ethylene ester copolymer and polyolefin containing a functional monomer
View Patent ↗The invention relates to a binding agent comprising a mixture of a carboxylic acid vinyl ethylene ester copolymer (A) and a polyolefin (B) containing a functional monomer (X), the mass ratio B/(A+B) being between 0.05 and 1. Said binder has very good adhesion properties for adhering to a number of supports in photovoltaic modules, in addition to satisfactory transparency and electrical resistivity properties for the advantageous use of the binder in said module.
1. Multilayer structure comprising a layer formed from a tie and at least a support made of PMMA, said tie being in direct contact with the support and comprising a blend of an ethylene/carboxylic acid vinyl ester copolymer (A) and a polyolefin (B) which contains a functional monomer (X) which is maleic anhydride copolymerized in the chain of the polyolefin (B) and/or grafted to the polyolefin (B), the B/(A+B) weight ratio being within the range of 0.05 to 1.
2. The multilayer structure according to claim 1 , in which the B/(A+B) weight ratio is between 0.05 and 0.5.
3. The multilayer structure according to claim 1 , in which the polyolefin (B) comprises ethylene.
4. The multilayer structure according to claim 1 , in which the functional monomer (X) contained in the chain of the polyolefin (B) is copolymerized.
5. The multilayer structure according to claim 1 , in which the amount of the functional monomer (X) in the polyolefin (B) is between 0.05 and 10 wt %.
6. The multilayer structure according to claim 1 , in which the polyolefin (B) containing a functional monomer (X) is an ethylene/alkyl (meth)acrylate/maleic anhydride copolymer.
7. The multilayer structure according to claim 1 , in which the polyolefin (B) containing a functional monomer (X) is an ethylene/vinyl acetate/maleic anhydride copolymer.
8. The multilayer structure according to claim 1 , in which the copolymer (A) is an ethylene/vinyl acetate copolymer.
9. The multilayer structure according to claim 1 , in which the carboxylic acid vinyl ester content of the copolymer (A) is between 25 and 45 wt %.
10. The multilayer structure according to claim 1 , in which the tie has an MFI between 1 and 400 g/10 min (190° C., 2.16 kg).