Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2001-02-20
2003-11-18
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C252S008610, C252S008620, C252S008630, C524S366000, C524S378000, C524S588000, C524S837000, C525S477000
Reexamination Certificate
active
06649692
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an organopolysiloxane composition containing a mixture of several specific types of liquid organopolysiloxanes, to emulsion-forming concentrates and aqueous emulsions formed therefrom and to the treatment of textile fiber and fabric substrates with the emulsions to improve such desirable properties of the substrates as their wettability and softness unaccompanied by any significant or appreciable yellowing.
2. Description of the Prior Art
The formulation and manufacture of organopolysiloxane-based aqueous emulsions and the treatment of natural and synthetic textile fiber and fabric substrates with the emulsions to improve one or more properties of the substrates, in particular, their softness, are well known and well developed technologies.
A major challenge in the formulation of any aqueous organopolysiloxane emulsion intended for use as a textile fiber and/or fabric treating agent is the difficulty of achieving a good, which is to say, commercially acceptable, balance in the properties of the fiber/fabric substrate treated with a given emulsion. For example, one emulsion might provide excellent softness, but at the expense of wettability and/or resistance to yellowing, another emulsion might provide excellent wettability but at the expense of softness and/or resistance to yellowing, and so forth.
Although much effort has been expended to develop aqueous organopolysiloxane emulsions that impart a good balance of properties to textile fiber and fabric substrates treated therewith, the satisfactory attainment of this goal can be quite elusive.
It is therefore an object of the invention to provide an organopolysiloxane composition which, when formulated as an aqueous emulsion and applied to a textile fiber or fabric substrate, will improve the wettability and softness properties of the substrate without, however, causing any significant or appreciable yellowing of the substrate.
Other objects of the invention include methods for making organopolysiloxane emulsion-forming concentrates and stable aqueous organopolysiloxane emulsions and employing the latter as textile treating agents.
SUMMARY OF THE INVENTION
In accordance with the present invention, an organopolysiloxane composition is provided which comprises:
a) organopolysiloxane I of the general formula
wherein each R
1
is, independently, an alkyl group of from 1 to 4 carbon atoms, R
2
is a divalent hydrocarbon group, R
3
is hydrogen or a monovalent hydrocarbon group, each A is, independently, an R
1
group or an R
2
(NHCH
2
CH
2
)
c
NHR
3
group, provided, that at least one A is an R
2
(NHCH
2
CH
2
)
c
NHR
3
group, a is from 1 to about 1000, b is from 0 to about 100 and c is from 0 to about 1000;
b) organopolysiloxane II of the general formula
(AB)
n
A
wherein n is from 2 to about 1000, A is a polysiloxane unit of the general formula
[X(C
a
H
2a
O)
b
R
2
(Si[R
1
]
2
O)
c
R
2
(OC
a
H
2a
)
b
X],
B is a polyalkyleneoxide unit of the general formula [YO(C
a
H
2a
O)
d
Y], each R
1
is, independently, an alkyl group of from 1 to 4 carbon atoms, R
2
is a divalent organic group, X and Y are divalent organic groups selected from a secondary or tertiary amine and a ring-opened epoxide such that when X is a ring-opened epoxide, Y is a secondary or tertiary amine and when X is a secondary or tertiary amine, Y is a ring-opened epoxide, each a is, independently, from 2 to 4, each b is independently from 0 to about 100, c is from 1 to about 500, d is from 0 to about 100 and the sum of b and d is from 1 to about 100;
c) organopolysiloxane III of the general formula
A(Si[R
1
]
2
O)
x
(Si[R
1
][E]O)
y
(Si[R
1
][G]O)
z
Si(R
1
)
2
A
wherein each R
1
is, independently, an alkyl group of from 1 to 4 carbon atoms, E is a monovalent organic group containing at least one epoxy group, G is an —(R
2
)
b
O(C
2
H
4
O)
c
(C
3
H
6
O)
d
R
3
group in which R
2
is a divalent organic group, R
3
is hydrogen or a monovalent hydrocarbon group, acyl group or monoester carbonate group, b is 0 or 1, c is from 0 to about 50, d is from 0 to about 50 and the sum of c and d is from 1 to about 100, each A is, independently, an R
1
or E group, x is from 0 to about 2000, y is from 0 to about 2000, z is from 1 to about 100 and the sum of x and y is from 1 to about 2000; and,
d) organopolysiloxane IV of the general formula
A(Si[R
1
]
2
O)
x
(Si[R
1
][G])
y
Si(R
1
)
2
A
wherein each R
1
is, independently, an alkyl group of from 1 to 4 carbon atoms, G is an —(R
2
)
b
O(C
2
H
4
O)
c
(C
3
H
6
O)
d
R
3
group in which R
2
is a divalent organic group, R
3
is hydrogen, a monovalent hydrocarbon group, an acyl group or a monoester carbonate group, b is 0 or 1, c is from 0 to about 50, d is from 0 to about 50 and the sum of c and d is from 1 to about 100, each A is, independently, an R
1
group or a monovalent organic group containing at least one epoxy group; x is from 0 to about 2000, y is from 0 to about 2000, and the sum of x and y is from 1 to about 2000.
Aqueous emulsions formed from the foregoing organopolysiloxane composition when applied in accordance with known and conventional methods to natural or synthetic textile fiber and fabric substrates, provide excellent levels of softness and wettability to the substrates but without discernable or apparent yellowing.
DETAILED DESCRIPTION OF THE INVENTION
1. The Components of the Organopolysiloxane Composition
As indicated above, the organopolysiloxane composition of this invention contains individual organopolysiloxanes I-IV as hereinafter further described.
Organopolysiloxane I
Organopolysiloxane I possesses the general formula
wherein each R
1
is, independently, an alkyl group of from 1 to 4 carbon atoms, R
2
is a divalent hydrocarbon group, R
3
is hydrogen or a monovalent hydrocarbon group, each A is, independently, an R
1
group or an R
2
(NHCH
2
CH
2
)
c
NHR
3
group, provided, that at least one A is an R
2
(NHCH
2
CH
2
)
c
NHR
3
group, a is from 1 to about 1000, b is from 0 to about 100 and c is from 0 to about 10.
In organopolysiloxane I, each R
1
is preferably a methyl group, R
2
is preferably a straight or branched chain alkylene group of from 2 to about 10 carbon atoms, ethylene and propylene being especially preferred, R
3
is preferably an alkyl group of from 1 to about 10 carbon atoms, methyl being especially preferred, a is preferably from about 50 to about 700, b is preferably from about 1 to about 30, c is preferably from 1 to 4 and the sum of a and b is preferably from about 50 to about 730.
For further details concerning organopolysiloxane I, reference may be made to U.S. Pat. No. 4,459,382, the contents of which are incorporated by reference herein. Organopolysiloxane I is advantageously present in the emulsion-forming concentrate at a level of from about 1 to about 50, and preferably from about 5 to about 20, weight percent based on the total weight of organopolysiloxanes I-IV.
Organopolysiloxanes II
Organopolysiloxane II possesses the general formula
(AB)
n
A
wherein n is from 2 to about 1000, A is a polysiloxane unit of the general formula
[X(C
a
H
2a
O)
b
R
2
(Si[R
1
]
2
O)
c
R
2
(OC
a
H
2a
)
b
X],
B is a polyalkyleneoxide unit of the general formula [YO(C
a
H
2a
O)
d
Y], each R
1
is, independently, an alkyl group of from 1 to 4 carbon atoms, R
2
is a divalent organic group, X and Y are divalent organic groups selected from a secondary or tertiary amine and a ring-opened epoxide such that when X is a ring-opened epoxide, Y is a secondary or tertiary amine and when X is a secondary or tertiary amine, Y is a ring-opened epoxide, each a is, independently, from 2 to 4, each b is independently from 0 to about 100, c is from 1 to about 500, d is from 0 to about 100 and the sum of b and d is from 1 to about 100.
In organopolysiloxane II, n is preferably from about 1 to about 10, each R
1
is preferably a methyl group, R
2
is preferably an ethylene or propylene group, each a
Lombardo John L.
Yu Hua
Crompton Corporation
Dawson Robert
Dilworth Michael P.
Zimmer Marc S
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