China Petrochemical has patented a method to produce grafted polypropylene resin using microwave irradiation without initiators. The resulting resin has no initiator residues, maintains its molecular mass, and contains polar side groups. The resin’s melt index is equal to or less than the base resin. GlobalData’s report on China Petrochemical gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on China Petrochemical, AI assisted CAD was a key innovation area identified from patents. China Petrochemical's grant share as of February 2024 was 69%. Grant share is based on the ratio of number of grants to total number of patents.

Grafted polypropylene resin without initiator residues

Source: United States Patent and Trademark Office (USPTO). Credit: China Petrochemical Corp

A recently granted patent (Publication Number: US11926687B2) discloses a novel grafted polypropylene resin with unique properties. The resin comprises a polypropylene backbone with side groups obtained by grafting polar monomers, such as organic acids, anhydrides, esters, or salts, with a grafting ratio of 0.01-8%. Notably, the resin does not contain any initiator residue and has a melt index equal to or less than the base resin. The method for preparing this resin involves subjecting the polar monomer and solid polypropylene resin to a grafting reaction using microwave irradiation without the need for an initiator. The resulting resin can be used in various applications, including as a compatibilizer in blending with other polymers, in the preparation of composite materials, coatable film materials, or bonding materials.

Furthermore, the patent also covers the preparation method, which includes specific steps like mixing the polar monomer with the solid polypropylene resin under vacuum conditions, irradiating the mixture with microwave irradiation, washing to remove unreacted components, and drying. The method also allows for the addition of inorganic microwave absorbing mediums to enhance the reaction. The resulting grafted polypropylene resin can be further processed into pellets or articles through extrusion pelletization or molding processes. Additionally, the resin can be blended with other polymers to create composite materials or used as a modification agent in plastics. The patent highlights the versatility and unique properties of the grafted polypropylene resin, opening up possibilities for innovative applications in various industries.

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GlobalData’s Patent Analytics tracks patent filings and grants from official offices around the world. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.