Low-Viscosity Hardener Manufacturing Method Patent
Summary
USPTO granted patent US12600706B2 to Nan Ya Plastics Corporation for a method of manufacturing low-viscosity hardener using isomerization of 3-methyltetrahydrophthalic anhydride and 4-methyltetrahydrophthalic anhydride. The patent covers a hardener crude product with a weight ratio of 3:7 to 7:3 between the two anhydrides, producing a final viscosity of 30-50 cps. The patent includes 8 claims and names Te-Chao Liao, Jung-Jen Chuang, Chung-Yu Chen, and Jung-Tsu Wu as inventors.
What changed
USPTO granted patent US12600706B2 to Nan Ya Plastics Corporation on April 14, 2026, covering a method for manufacturing low-viscosity hardeners through isomerization of hardener crude products containing 3-methyltetrahydrophthalic anhydride and 4-methyltetrahydrophthalic anhydride. The patent specifies a weight ratio between 7:3 and 3:7 for these anhydrides and a final viscosity range of 30-50 cps.
Manufacturers in the chemical, coatings, adhesives, and composite industries should review this patent for potential licensing requirements or to assess freedom-to-operate for their own hardener manufacturing processes. The 8-claim patent provides enforceable IP protection for Nan Ya Plastics in the epoxy hardener market.
What to do next
- Monitor patent database for related applications
- Review patent claims for freedom-to-operate analysis
Archived snapshot
Apr 14, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Method for manufacturing low-viscosity hardener
Grant US12600706B2 Kind: B2 Apr 14, 2026
Assignee
NAN YA PLASTICS CORPORATION
Inventors
Te-Chao Liao, Jung-Jen Chuang, Chung-Yu Chen, Jung-Tsu Wu
Abstract
A method for manufacturing a low-viscosity hardener is provided. The method includes the followings steps: providing a hardener crude product; and subjecting the hardener crude product and an alkaline catalyst to an isomerization reaction, so as to obtain the low-viscosity hardener. The hardener crude product contains 3-methyltetrahydrophthalic anhydride and 4-methyltetrahydrophthalic anhydride, and a weight ratio of the 3-methyltetrahydrophthalic anhydride to the 4-methyltetrahydrophthalic anhydride ranges from 7:3 to 3:7. A viscosity of the low-viscosity hardener ranges from 30 cps to 50 cps.
CPC Classifications
C07D 307/77 C07D 307/89
Filing Date
2023-01-11
Application No.
18152968
Claims
8
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