Etex has filed a patent for a curable formaldehyde-free resin in the form of an aqueous dispersion. The resin includes a reducing sugar, a polycarboxylic acid, one or more polyols with a molecular weight of less than 1000 g/mol, and epoxysilane. The resin has specific weight percentages for each component. The patent also includes a method for manufacturing the resin. GlobalData’s report on Etex 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 Etex, prosthetic cardiac valves was a key innovation area identified from patents. Etex's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
A curable formaldehyde-free resin has been described in a recently filed patent (Publication Number: US20230174730A1). The resin is in the form of an aqueous dispersion and consists of several components. Component a) is a reducing sugar, which can be selected from monosaccharides, oligosaccharides, polysaccharides, or mixtures thereof. Component b) is a polycarboxylic acid, which can be citric acid, succinic acid, tartaric acid, adipic acid, anhydrides, salts thereof, or combinations thereof. Component c) is one or more polyols with a molecular weight of less than 1000 g/mol, such as ethylene glycol, tetraethylene glycol, 1,4-butanediol, and others. Component d) is epoxysilane.
The total amount of component c) in the curable formaldehyde-free resin is between 0.5% and 10% by weight with respect to the sum of components a) and b). The amount of component d) is from 0.1% to less than or equal to 2% by weight with respect to the sum of components a) and b).
The patent also describes specific embodiments of the curable formaldehyde-free resin. For example, in one embodiment, component a) is a dextrin, particularly a maltodextrin with a DE (dextrose equivalent) between 11 and 21. In another embodiment, component a) is a maltodextrin with a DE between 17 and 19, and component b) is citric acid. The resin can also consist of 50% to 80% by weight maltodextrin and 20% to 50% by weight citric acid, preferably 60% to 70% maltodextrin and 25% to 40% citric acid.
The patent further discloses that the polyol component c) can be selected from various options, including ethylene glycol, tetraethylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, glycerol, diglycerol, triglycerol, triethanolamine, diethanolamine, trimethylolpropane, propylene glycol, poly(ethylene) glycol, and combinations thereof. The total amount of component c) in the resin can range from 1% to 6% by weight with respect to the sum of components a) and b), preferably between 2% and 5% by weight, and more preferably between 3% and 4% by weight.
The patent also includes a method for manufacturing the curable formaldehyde-free resin, which involves premixing component c) and component d). Additionally, the resin can be used as a binder for mineral wool, and the cured binder can be applied to mineral fibers to produce a mineral wool product. The cured binder is obtained by curing the resin at temperatures higher than 100°C.
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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.
