US 11,718,736 B2
Binder for injection moulding compositions
Damien Cartier, Besancon (FR); and Jonathan Dumain, Besancon (FR)
Assigned to Comadur S.A., Le Locle (CH)
Filed by Comadur S.A., Le Locle (CH)
Filed on Apr. 10, 2019, as Appl. No. 16/380,360.
Claims priority of application No. 18170805 (EP), filed on May 4, 2018.
Prior Publication US 2019/0337858 A1, Nov. 7, 2019
Int. Cl. C08L 23/08 (2006.01); B22F 1/103 (2022.01); B29C 45/00 (2006.01); C04B 35/10 (2006.01); C04B 35/48 (2006.01); C04B 35/634 (2006.01); C08K 5/20 (2006.01); C08L 23/16 (2006.01); C08L 91/06 (2006.01); B22F 1/10 (2022.01)
CPC C08L 23/08 (2013.01) [B22F 1/103 (2022.01); B29C 45/0001 (2013.01); C04B 35/10 (2013.01); C04B 35/48 (2013.01); C04B 35/63404 (2013.01); C04B 35/63408 (2013.01); C04B 35/63424 (2013.01); C08K 5/20 (2013.01); C08L 23/16 (2013.01); C08L 91/06 (2013.01); B22F 1/10 (2022.01); B29K 2905/02 (2013.01); B29K 2905/08 (2013.01); B29K 2909/02 (2013.01); C08L 2205/035 (2013.01)] 20 Claims
 
1. A binder suitable for an injection molding composition, the binder comprising, based on total binder volume:
a polymeric base, in a range of from 40 to 55 vol. %;
a mixture of waxes, or a mixture of wax and palm oil, in a range of from 35 to 45 vol. %; and
a surfactant, in at least 5 vol. %,
wherein the polymeric base of comprises (i) a copolymer ethylene and methacrylic or acrylic acid, (ii) a copolymer of ethylene and propylene and/or maleic anhydride-grafted polypropylene, and (iii) a solvent-soluble polymer, soluble in isopropyl alcohol, propyl alcohol, turpentine, or a mixture thereof, and
wherein the solvent-soluble polymer (iii) is a cellulose acetate butyrate, a polyvinyl butyral, and/or a copolyamide, and
wherein the binder has a lower viscosity, measured with a capillary rheometer with a 1 mm diameter and 20 mm length die, at 172° C. and shear rates of 10, 100, and 1000 Hz, than a binder lacking the solvent-soluble polymer (iii).