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US 12,116,433 B2Granted
Terpolymers for caps and closures
AssigneeBraskem S.A.
InventorFrancisco Carlos Ruiz
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Abstract
Polymer compositions may comprise propylene, present in a range of 80 to 95 wt % of the polymer composition, and two comonomers selected from a group comprising ethylene and C4-C10 alpha olefins, wherein the polymer composition has a total content of the comonomers in the range of 5 to 20 wt % of the polymer composition. Cap liners may be formed from the polymer compositions. Caps may comprise a closure formed from polypropylene and a polypropylene-based cap liner that lines at least a portion of the closure.
Claims19
A cap liner formed by compression molding a terpolymer composition comprising:
- propylene present in a range of 80 to 95 wt % of the terpolymer composition;
- and
- two comonomers selected from the group consisting of ethylene and C4-C10 alpha olefins,
- wherein the terpolymer composition has a total content of the comonomers in a range of 5 to 20 wt % of the terpolymer composition,
- wherein the terpolymer composition has a flexural modulus at the −1% secant, according to ASTM D790, ranging from 500 to 900 MPa, and
- the terpolymer composition has a melt flow rate, according to ASTM D1238, ranging from 2.0 to 15.0 g/10 min.
3 more elements
Dependencies are inferred from the claim text.