A modified polybutylene terephthalate composition for contact lens molds and a method for preparing the same

By modifying the polybutylene terephthalate composition, the problems of dimensional stability, light transmittance, and demolding properties of contact lens mold materials have been solved, resulting in a mold material with high light transmittance, excellent dimensional stability, and low cost, which is suitable for the preparation of disposable contact lens molds.

CN122127743APending Publication Date: 2026-06-02GANSU JINGKAIDA NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GANSU JINGKAIDA NEW MATERIALS CO LTD
Filing Date
2026-03-16
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing contact lens mold materials suffer from poor dimensional stability, insufficient light transmittance, difficulty in demolding, easy adhesion to molding monomers, and excessive cost, making them unsuitable for the application requirements of disposable molds.

Method used

A modified polybutylene terephthalate (PBT) composition was developed. Polyethylene glycol and hydroxylated polysiloxane were combined as hydrophilic modifiers, and then combined with dimensional stabilizer PMMA, toughening agent EBA-GMA, compatibilizer ABS-g-MAH, and coupling agent KH-550 to form a special modified PBT composition. This composition solved the problems of insufficient hydrophilicity, difficult demolding, and interaction with monomers in pure PBT.

Benefits of technology

It significantly improves the light transmittance and dimensional stability of the mold, enhances demolding performance, avoids adhesion between the lens and the mold, reduces production costs, and is suitable for large-scale production of disposable contact lens molds.

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Abstract

This invention belongs to the field of polymer material modification technology, and discloses a modified polybutylene terephthalate (PBT) composition for contact lens molds and its preparation method. The composition of this invention comprises: 60-75 parts of PBT, 5-10 parts of a hydrophilic modifier, 8-15 parts of a dimensional stabilizing modifier, 3-8 parts of a toughening agent, 2-5 parts of a compatibilizer, 0.3-1.0 parts of a coupling agent, 0.2-0.6 parts of an antioxidant, and 0.5-1.5 parts of a lubricant. The modified PBT composition of this invention has low dimensional shrinkage, high light transmittance, and suitable surface hydrophilicity, preventing lens breakage. The mold is less prone to breakage and cracking during injection molding and use, making it suitable for large-scale production of disposable contact lens molds and possessing extremely high market application value.
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