Kao has filed a patent for an inkjet ink that includes a terpene phenol resin and a carbonate ester with a boiling point below 150°C. The ink is used to create printed articles and can be applied using a thermal inkjet printhead. GlobalData’s report on Kao 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 Kao, Nanoemulsion cosmetics was a key innovation area identified from patents. Kao's grant share as of September 2023 was 38%. Grant share is based on the ratio of number of grants to total number of patents.

Inkjet ink with terpene phenol resin and carbonate ester

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

A recently filed patent (Publication Number: US20230312952A1) describes an inkjet ink formulation that offers improved performance and drying characteristics. The inkjet ink comprises a terpene phenol resin with a hydroxyl value of 10 to 80 mgKOH/g and a carbonate ester with a boiling point below 150°C.

The terpene phenol resin used in the inkjet ink is a copolymer formed from a reaction between a monoterpene and a phenolic compound. The monoterpene can be selected from 3-carene, a-pinene, ß-pinene, and camphene. The phenolic compound used is phenol.

The terpene phenol resin has a hydroxyl value ranging from 25 to 60 mgKOH/g. It is present in the inkjet ink in an amount of 0.1 to 10 wt. %, based on the total weight of the inkjet ink. The carbonate ester, specifically dimethyl carbonate, is present in an amount of up to 50 wt. %.

The weight ratio of the carbonate ester to the terpene phenol resin is between 2:1 and 25:1. The inkjet ink may also contain ethanol, with a weight ratio of the carbonate ester to ethanol ranging from 0.05:1 to 0.80:1. Additionally, the inkjet ink may include an alkanolamine, such as ethanolamine, propanolamine, isopropanolamine, diethanolamine, or triethanolamine, in an amount of 0.1 to 10 wt. %.

To enhance the performance of the inkjet ink, a silicone acrylate copolymer can be added in an amount of up to 5 wt. %. The inkjet ink may also contain a colorant for printing purposes.

The patent also describes a printed article that includes a substrate with a dried form of the inkjet ink applied to it. Furthermore, a method of forming a printed image on a substrate is disclosed, involving the application of the inkjet ink onto the substrate using a thermal inkjet printhead and subsequent drying. The inkjet ink can be dried by exposure to air for 30 seconds or less, eliminating the need for a heater.

In summary, this patent presents an inkjet ink formulation that combines a terpene phenol resin and a carbonate ester to improve ink performance and drying characteristics. The inkjet ink can be used to create printed articles and offers a method for forming printed images on substrates using a thermal inkjet printhead.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. 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.