US 11,749,422 B2
Silane functional stabilizers for extending long-term electrical power cable performance
Glen J. Bertini, Fox Island, WA (US); David C. Busby, Midland, MI (US); Ramanathan Ravichandran, Suffern, NY (US); and Miles J. Hutchings, Scarsdale, NY (US)
Assigned to Novinium, LLC, Kent, WA (US)
Filed by Novinium, LLC, Kent, WA (US)
Filed on Jul. 15, 2020, as Appl. No. 16/930,138.
Claims priority of provisional application 62/876,967, filed on Jul. 22, 2019.
Claims priority of provisional application 62/874,155, filed on Jul. 15, 2019.
Prior Publication US 2021/0017384 A1, Jan. 21, 2021
Int. Cl. H01B 3/46 (2006.01); H01B 7/18 (2006.01); C08L 83/06 (2006.01)
CPC H01B 3/46 (2013.01) [C08L 83/06 (2013.01); H01B 7/1805 (2013.01); C08L 2201/08 (2013.01); C08L 2203/206 (2013.01); C08L 2314/08 (2013.01)] 19 Claims
 
1. A method for extending the useful life of in-service electrical cable, comprising injecting a dielectric enhancement fluid composition into at least one section of an electrical cable having a stranded conductor encased in a polymeric insulation jacket, and having an average operating temperature T, the composition comprising:
(a) at least one organoalkoxysilane functional additive selected from the group consisting of
(i) a voltage stabilizer-based alkoxysilane compound of Formula 1

OG Complex Work Unit Chemistry
wherein:
m is 1-4;
A is a linear or branched alkylene radical containing from 1 to 10 carbon atoms, or one of

OG Complex Work Unit Chemistry
where S3, S4 and S5 are linear or branched alkylene radicals containing a total of between 3 and 10 carbon atoms, and T is oxygen or sulfur;
X is a linear or branched alkyl radical containing from 1 to 5 carbon atoms;
Y is C1-C4 acyloxy, C1-C4 alkyloxy, amino, amino-oxy or silyloxy; and
n is one, two or three,
(ii) a hindered amine light stabilizer (HALS)-based alkoxysilane of formula (XI)

OG Complex Work Unit Chemistry
wherein:
m+n is a number from 1 to 40, n varies from zero to 50% of the sum m+n;
A is —O—;
T1 and T4 which can be identical or different are methyl, methoxy, ethoxy or OH;
T2 is trimethylene or is also a direct bond if A is —O— and T1 and T4 are methyl;
T3 is methyl, C7-C9 alkyl or cyclohexyl;
T5 is C1-C12 alkyl;
X1 is as defined for T1 or is a group (CH3)3 SiO—; and
X2 is hydrogen, methyl, ethyl, a group (CH3)3 Si— or, if n is zero and T1 and X1 are methyl,
X2 is also a group of the formula (XIII)

OG Complex Work Unit Chemistry
and, if m+n is a number from 3 to 10, X1 and X2 together can also be a direct bond, and
(iii) a UV absorber-based alkoxysilane compound of formula (IA) or (IIA)

OG Complex Work Unit Chemistry
wherein:
G1 and G6 are hydrogen;
G2 and G7 are independently H, cyano, CF3—, fluoro, —CO—G3, or E3SO2—;
G3 is straight or branched chain alkyl of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl of 1 to 4 carbon atoms;
E1 is phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl groups of 1 to 4 carbon atoms each;
E2 and E9 are independently straight or branched alkyl chain of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 3 alkyl of 1 to 4 carbon atoms; or E2 is said alkyl of 1 to 24 carbon atoms or said alkenyl of 2 to 18 carbon atoms substituted by one or more —OH, —OCOE11, —OE4,—NCO, —NH2, —NHCOE11, —NHE4 or —N(E4)2, or mixtures thereof, where E4 is straight or branched chain alkyl of 1 to 24 carbon atoms; or said alkyl or said alkenyl interrupted by one or more —O—, —NH—, or —NE4— groups or mixtures thereof and which can be unsubstituted or substituted by one or more —OH, —OE4, or —NH2 groups or mixtures thereof,
E11 is hydrogen, straight or branched chain alkyl of 1 to 18 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, aryl of 6 to 14 carbon atoms or phenylalkyl of 7 to 15 carbon atoms;
E3 is alkyl of 1 to 20 carbon atoms, hydroxyalkyl of 2 to 20 carbon atoms, alkenyl of 3 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, aryl of 6 to 10 carbon atoms or said aryl substituted by one or two alkyls of 1 to 4 carbon atoms or 1,1,2,2-tetrahydroperfluoroalkyl where the perfluoroalkyl moiety is of 6 to 16 carbon atoms;
L is methylene; and
with the proviso that at least one of E1, E2 and E9 contains a group —T1—Si(OR2)n(R1)3-n, —T1—X—CO—X—T2—Si(OR2)n(R1)3-n, T1—CO—X—T2—Si(OR2)n(R1)3-n, —X—T1—Si(OR2)n(R1)3-n or —X—T1—X—CO—X—T2—Si(OR2)n(R1)3-n,
where, for E1, E2 and E9, T1 and T2 are independently alkylene of 2 or 3 carbon atoms, and R1 and R2 are independently alkyl of 1 to 6 carbon atoms or phenyl, and n is 1, 2, or 3, and X is —O—, —NE4— or —NH—; and
(b) at least one catalyst suitable to catalyze hydrolysis and condensation of the at least one functional additive of (a),
wherein the at least one organoalkoxysilane functional additive of (a) comprises:
at least one of the voltage stabilizer-based alkoxysilane compounds of Formula (1) of (i) and at least one of the HALS-based alkoxysilane of formula (XI) of (ii); and/or
at least one of the voltage stabilizer-based alkoxysilane compounds of Formula (1) of (i) and at least one of the UV absorber-based alkoxysilane compounds of formula (IA) or (IIA) of (iii); and/or
at least one of the HALS-based alkoxysilane of formula (XI) of (ii) and at least one of the UV absorber-based alkoxysilane compounds of formula (IA) or (IIA) of (iii), and
wherein the injected composition provides for both initial permeation of the at least one functional additive into the polymeric insulation, and extended retention of subsequent condensation products of the at least one functional additive in the cable insulation.