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US 12,577,337 B2Granted
Method to process fluorinated thermoplastic elastomers
AssigneeArkema Inc.
InventorsAdam W. Hauser, Azaz A. Vahora, Mathieu Y. Capelot, Yves Deyrail, Francois Bargain
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Abstract
An injection molding process to mold a fluorinated thermoplastic elastomeric polymer composition is disclosed. An article made using the process has little shrinkage.
Claims18
A process to mold a fluorinated thermoplastic elastomeric polymer composition, wherein the process comprises the steps of:
- a. providing a semicrystalline fluorinated thermoplastic elastomeric polymer composition with a ΔH of formation between 1 and 30 J/g,
- b. injection molding the fluorinated thermoplastic elastomeric polymer composition wherein
- i. the barrel temperature is between 3° and 200° C. above the Tm,
- ii. the mold temperature is less than melt transition (Tm),
- iii. the mold cooling time is greater than 60 sec.
- wherein the Tm of the composition is below 120° C., and the crystallization temperature of the composition (Tc) is at least 0° C., with the proviso that Tc is at least 15° C. below the Tm for the given composition.
3 more elements
A process to mold a fluorinated thermoplastic elastomeric composition, wherein the process comprises the steps of:
- a. Providing a semicrystalline polymer composition with a ΔH of formation between 1 and 10 J/g,
- b. Injection molding the polymer with:
- i. barrel temperatures between 5° and 200° C. above the Tm,
- ii. mold temperatures below the melt transition (Tm), preferably between the Tc and the Tm, more preferably 10-60° C. below the Tm,
- iii. mold cooling times from 80-800 sec,
- wherein the fluorinated thermoplastic elastomeric composition comprises a blend of a H polymer and a S polymer in a ratio of from 20% to 80% H, wherein the Tm of the composition is below 120° C., and the Tc is at least 0° C., with the proviso that Tc is at least 15° C. below the Tm for the given composition.
3 more elements
A process to mold a fluorinated thermoplastic elastomeric polymer composition, wherein the process comprises the steps of:
- a. providing a semicrystalline fluorinated thermoplastic composition with a AH of formation between 1 and 30 J/g, elastomeric polymer
- b. injection molding the fluorinated thermoplastic elastomeric polymer composition wherein
- i. the barrel temperature is between 30 and 200° C. above the Tm,
- ii. the mold temperature is less than melt transition (Tm),
- iii. the mold cooling time is greater than 60 sec;
- wherein the Tm of the fluorinated thermoplastic elastomeric polymer composition is greater than 40° C. and the fluoropolymer thermoplastic elastomeric polymer composition comprises a fluoropolymer blend comprising fluoropolymer S and fluoropolymer H wherein:
- wherein fluoropolymer H is a copolymer of vinylidene fluoride (VDF) and hexafluoropropene (HFP) and comprises at least 70 wt % percent of VDF, and from 0 to 30 wt % of HFP, and
- fluoropolymer S is a copolymer of VDF and HFP, and comprises at least 35 weight percent of HFP, and wherein the amount of His from 20 to 80 weight % of the composition, and the amount of S is from 20 to 80 weight % of the composition.
5 more elements
Dependencies are inferred from the claim text.