Water repellent composition

Details Water repellent composition Water repellent composition

2001-10-30

2003-07-08

Nutter, Nathan M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S200000

Reexamination Certificate

active

06590035

ABSTRACT:

The present invention relates to a water repellent composition.
As water repellent treatment has become common, the performance required for fibers has been increasingly high. In recent years, it is required that fibers will exhibit a high level of water repellency continuously even under severe conditions in outdoor applications such as mountain climbing and skiing. Against such requirement, the following methods of treating fibers have been proposed.
(1) A method of treating fibers by means of an aqueous dispersion containing a fluorine-containing copolymer and a water-soluble amino resin (such as an N-methylol-modified melamine resin) (JP-A-56-165072).
(2) A method of treating fibers by means of a treating agent comprising a fluorine-containing copolymer and an isocyanate compound (JP-A-61-19684).
(3) A method of treating fibers by means of an aqueous dispersion containing a fluorine-containing copolymer having isocyanate groups and hydroxyl groups, and a blocked isocyanate compound (U.S. Pat. No. 4,834,764).
However, these methods have been still inadequate to realize excellent water repellency and its durability required for fibers at a practical level.
It is an object of the present invention to provide a water repellent composition which is capable of imparting excellent water repellency and its durability to an article such as fibers.
The present invention provides a water repellent composition comprising the following polymer (A) and the following polymer (B), wherein the polymer (A) and the polymer (B) are not present in the same particles:
Polymer (A): an addition polymer comprising at least 60 mass % of polymerized units of the following polymerizable monomer (a) and at most 40 mass % (inclusive of 0 mass %) of polymerized units of the following polymerizable monomer (b), and, if necessary, polymerized units of a polymerizable monomer (x) other than the polymerizable monomers (a) and (b), wherein the total of the polymerized units of the polymerizable monomer (a) and the polymerized units of the polymerizable monomer (b) is at least 70 mass %; and
Polymer (B): an addition polymer comprising less than 60 mass % (inclusive of 0 mass %) of polymerized units of the polymerizable monomer (a) and at least 30 mass % of polymerized units of the following polymerizable monomer (c), and, if necessary, polymerized units of a polymerizable monomer (y) other than the polymerizable monomers (a) and (c), wherein the total of the polymerized units of the polymerizable monomer (a) and the polymerized units of the polymerizable monomer (c) is at least 50 mass %:
Polymerizable monomer (a): a (meth)acrylate having a polyfluoroalkyl group;
Polymerizable monomer (b): a (meth)acrylate having a long chain alkyl group and not having a polyfluoroalkyl group; and
Polymerizable monomer (c): a polymerizable monomer other than the polymerizable monomers (a) and (b), having a SP value of less than 10.
Further, the present invention provides an article treated with such a water repellent composition.
Now, the present invention will be described in detail with reference to the preferred embodiments.
In this specification, acrylic acid and methacrylic acid will generally be represented by (meth)acrylic acid. The same will apply with respect to a representation such as a (meth)acrylate. Further, a polyfluoroalkyl group is represented by a R
f
group.
Polymer (A) is an addition polymer comprising at least 60 mass % of polymerized units of the polymerizable monomer (a) and at most 40 mass % (inclusive of 0 mass %) of polymerized units of the polymerizable monomer (b), and, if necessary, polymerized units of a polymerizable monomer (x) other than the polymerizable monomers (a) and (b), wherein the total of the polymerized units of the polymerizable monomer (a) and the polymerized units of the polymerizable monomer (b) is at least 70 mass %. Namely, polymer (A) may not contain polymerized units of the polymerizable monomer (b).
The polymerizable monomer (a) (hereinafter referred to as the monomer (a)) is a (meth)acrylate having a R
f
group. The (meth)acrylate having a R
f
group means a compound wherein the R
f
group is present in the alcohol residue moiety of a (meth)acrylic acid ester.
The R
f
group is a group having at least two hydrogen atoms of an alkyl group substituted by fluorine atoms. The carbon number of the R
f
group is preferably from 2 to 20, particularly preferably from 6 to 16. If the carbon number is less than 2, the water repellency tends to be low, and if it exceeds 20, the monomer (a) tends to be solid at room temperature, and its sublimation property tends to be high, whereby handling tends to be difficult.
Further, the R
f
group may be of a straight chain structure or a branched structure, but a straight chain structure is preferred. In the case of a branched structure, it is preferred that the branched moiety is present at the terminal portion of the R
f
group, and the branched moiety is a short chain having a carbon number of from about 1 to 4.
Further, the R
f
group may contain, in addition to fluorine atoms, other halogen atoms. As such other halogen atoms, chlorine atoms are preferred. Further, an etheric oxygen atom or a thioetheric sulfur atom may be inserted between a carbon—carbon bond in the R
f
group. The structure of the terminal portion of the R
f
group may, for example, be CF
3
CF
2
—, (CF
3
)
2
CF—, CHF
2
—, CH
2
F— or CCl F
2
—. CF
3
CF
2
— is preferred.
The number of fluorine atoms in the R
f
group is preferably at least 60%, particularly preferably at least 80%, as represented by [(number of fluorine atoms in the R
f
group)/(number of hydrogen atoms contained in the corresponding alkyl group having the same carbon number as the R
f
group)]×00(%). As the R
f
group, a perfluoroalkyl group (hereinafter referred to as a R
F
group) is preferred. As the RF group, preferred is a R
F
group having a straight chain structure i.e. a group represented by F(CF
2
)
i
— (wherein i is an integer of from 2 to 20). Particularly preferred is a group wherein i is an integer of from 6 to 16.
Specific examples of the R
f
group will be given below. The following examples include structurally isomeric groups i.e. groups which have the same molecular formula but have different structures.
C
4
F
9
—[F(CF
2
)
4
—, (CF
3
)
2
CFCF
2
—, (CF
3
)
3
C—], C
5
F
11
—[such as F(CF
2
)
5
— or (CF
3
)
3
CCF
2
—], C
6
F
13
—[such as F(CF
2
)
6
—], C
7
F
15
—, C
8
H
17
—, C
9
F
19
—, C
10
F
21
—, Cl(CF
2
)
t
—, H(CF
2
)
t
— (t is an integer of from 2 to 20), (CF
3
)
2
CF(CF
2
)
y
— (y is an integer of from 1 to 17), etc.
Specific examples of a case where the R
f
group is a group having an etheric oxygen atom or a thioetheric sulfur atom inserted between a carbon—carbon bond, will be given below, wherein r is an integer of from 1 to 5, z is an integer of from 1 to 6, and w is an integer of from 1 to 9.
F(CF
2
)
5
OCF (CF
3
)—, F[CF(CF
3
)CF
2
O]
r
CF(CF
3
)CF
2
CF
2
—, F[CF(CF
3
)CF
2
O]
z
CF(CF
3
)—, F[CF(CF
3
)CF
2
O]
z
CF
2
CF
2
—, F(CF
2
CF
2
CF
2
O)
z
CF
2
CF
2
—, F(CF
2
CF
2
O)
z
CF
2
CF
2
—, etc.
F(CF
2
)
5
SCF(CF
3
)—, F[CF(CF
3
)CF
2
S]
r
CF(CF
3
)CF
2
CF
2
—, F[CF(CF
3
)CF
2
S]
z
CF(CF
3
)—, F[CF(CF
3
)CF
2
S]
z
CF
2
CF
2
—, F(CF
2
CF
2
CF
2
S)
z
CF
2
CF
2
—, F(CF
2
CF
2
S)
w
CF
2
CF
2
—, etc.
As the monomer (a), a compound represented by the following formula 1 is preferred. However, in the formula 1, R
f
is a R
f
group, Q is a bivalent organic group, and R
1
is a hydrogen atom or a methyl group.
R
f
—Q—OCOCR
1
═CH
2
  Formula 1
In the formula 1, Q is preferably, for example, —(CH
2
)
p+q
—, —(CH
2
)
p
CONH(CH
2
)
q
—, —(CH
2
)
p
OCONH(CH
2
)
q
—, —(CH
2
)
p
SO
2
NR
2
(CH
2
)
q
—, —(CH
2
)
p
NHCONH(CH
2
)
q
—, or —(CH
2
)
p
CH(OH)(CH
2
)
q
—, wherein R
2
is a hydrogen atom or an alkyl group, and each of p and q is an integer of 0 or more, provided that p+q is an integer of from 1 to 22.
Among them, preferred is —(CH
2
)
p+q
—, —(CH
2
)

Affiliated with

Also associated with

Rating

Water repellent composition does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Water repellent composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water repellent composition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3103258