US 11,732,155 B2
Epoxy casting resin formulation
Mathis A. Muth, Essen (DE); Michael Petry, Dinslaken (DE); and Adrian T. Jung, Kaarst (DE)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 16/485,871
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 8, 2017, PCT No. PCT/IB2017/057751
§ 371(c)(1), (2) Date Aug. 14, 2019,
PCT Pub. No. WO2018/167551, PCT Pub. Date Sep. 20, 2018.
Claims priority of application No. 17161430 (EP), filed on Mar. 16, 2017.
Prior Publication US 2019/0390080 A1, Dec. 26, 2019
Int. Cl. C09D 163/00 (2006.01); C09D 7/65 (2018.01); C09D 7/61 (2018.01); C09D 7/41 (2018.01); B29C 39/00 (2006.01); B29C 39/18 (2006.01); H02G 1/14 (2006.01); H02G 15/08 (2006.01); B29K 63/00 (2006.01); B29K 105/00 (2006.01); B29K 505/02 (2006.01); B29L 31/34 (2006.01)
CPC C09D 163/00 (2013.01) [B29C 39/003 (2013.01); B29C 39/18 (2013.01); C09D 7/41 (2018.01); C09D 7/61 (2018.01); C09D 7/65 (2018.01); H02G 1/145 (2013.01); H02G 15/08 (2013.01); B29K 2063/00 (2013.01); B29K 2105/0032 (2013.01); B29K 2505/02 (2013.01); B29L 2031/3462 (2013.01)] 18 Claims
 
1. A curable casting resin precursor, comprising
(a) a first part (A) comprising:
(a1) at least one epoxy resin;
(b) a second part (B) comprising:
(b1) at least one first amine-based epoxy curing agent selected from a phenalkamine,
the phenalkamine being a reaction product of cardanol, formaldehyde and an amine, and
the phenalkamine being present in an amount of 10 to 45 wt % with respect to the weight of the second part (B);
(b2) optionally, at least one second amine-based epoxy curing agent, if present, the at least one second amine-based epoxy curing agent being present in an amount of 1.5 to 10 wt % with respect to the weight of the second part (B);
(b3) at least one mineral filler;
(b4) at least one phenolic lipid; and
at least one triphenylmethane dye,
wherein the at least one triphenylmethane dye is within the first part (A) and/or the second part (B).