Fluorinated thermoplastic elastomers
AssigneeAusimont S.p.A.
InventorsGiulio Brinati, Vincenzo Arcella
Life of this patent
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Abstract
Compositions containing fluorinated thermoplastic elastomers with different moelcular weight and with different plastomeric phase/elastomeric phase ratio, essentially formed by: (a) 30-80% by weight, preferably 50-80%, of a fluorinated thermoplastic elastomer, having a block structure of A-B-A type, wherein A is a plastomeric segment and B is an elastomeric segment; (b) 10-50% by weight, preferably 20-40% of a fluorinated thermoplastic elastomer having a block structure of A-B-A type; (c) 0-30% by weight, preferably 0-15%, of a fluorinated plastomer preferably of the same kind as that contained in the component (a) and/or (b).
Claims21
A composition containing fluorinated thermoplastic elastomers with different molecular weights and with different plastomeric phase/elastomeric phase ratios, said composition having a dynamic viscosity determined by rheogoniometer RMS® 800 (Frequency sweep, frequency of 10−2 radiants/sec, parallel plates) lower than 107 poise and Melt Flow Index (MFI), determined according to the ASTM D 1238-52T standard with a 5 Kg load, greater than 1 (g/10 minutes), consisting essentially of:
- (a) 30-80% by weight of a fluorinated thermoplastic elastomer having a block structure A-B-A, wherein A is a plastomeric segment and B is an elastomeric segment, in which:
- at least one block is formed by a fluorinated elastomer and at least one block by a fluorinated plastomer;
- the elastomeric segment B having a Mooney viscosity greater than 10;
- the amount of plastomeric phase A is between 5 and 40% by weight;
- the MFI of the thermoplastic elastomer is less than 0.1;
- (b) 10-50% by weight of a fluorinated thermoplastic elastomer having a block structure of A-B-A, wherein A and B are as defined above, in which:
- there is at least a fluorinated elastomeric segment and at least a fluorinated plastomeric segment;
- the elastomer B has a Mooney viscosity less than 5;
- the plastomeric phase A is between 2 and 20% by weight;
- the MFI of the thermoplastic elastomer (b) is greater than 100;
- (c) 0-30% by weight of a fluorinated plastomer having an MFI value greater than 1.
Dependencies are inferred from the claim text.