CA1277101C - Partially detackified leather and glove - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A permanently tackified leather glove having its inner surface detackified with a solution containing nitrocellulose and silicone resins and process for making same as well as the leather therefor.

Description

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PA~TIALLY DETACKIFIED LEATH~ AND GLOVE

FIELD OF T}llE INVENTION
~ his lnvention re1ates to a me'chod ~or ~che production oi~ leath~r perrnan~nt1y tacklfl~d on on~ ~ld~ and detackl~ied on tho other (non-tackl1ed bac~c, herein designated N~) and ~port or worlc glcve made ~rom said leather.
Such glove ls more com~orta~le to w~ar than a glove tackifl~d on both sides.
BA~X~RO~ AND PR~OR MT
I~ is g~nera11y knowa to provido t~ck~ d ~10ves ~or app1ica~ions where . improv~d gripping securlty is impor~ant, ~.g. ~ol~, racguetb~11, tennis, s¢uash, soccer, ~ootball, basebal1, etc.
In order to accomplish thi~, various coatlngs such as polyux~than2s and latlce~ hav~ ~en emp10yed. Moreover, in snan Of~en1egu2l~ssch~ift 2a 40 197, it was su~gested to coat a 3t~cky m~t~rial on~o tho sux~aco o:E tha g10ve, pr~i~e~ ly by th~ u3~ o~ ~n adlhosive spray.
E~ vor, none o~ the~ known app~oaches are antlxely o sa'cl3~acto~y. U~e~chane~ and latices lack the rc~uisite ~cac~c or ooo~iclsnt of S~iction and do not posses~ th~ "~e~1" o~
1~ath~r. Moreovor, adhesiv~ ¢oating~ oE the spray-on type ~end to ldlclc ~erm~nenc~ and a1s4 deteriorate the leathex.

~2~

In the applicant's previous approach to tackifying leather, both sides of the leather were tackified. In a glove, this i5 disaclvantageous because of the discomfort in having a tacky inner surface in contact with the hand of the wearer.
While the above-described German reference does not have this problem hecause the ta~kified coatiny is sprayed on the sur-face of the leather, it also does not have the desired permanence that is irnparted to the glove when it is tackified hy impregnation in a solutlon of a tackifying resin.
OBJECTIVES AND BRIEF U MARY OF THE _V NTION
Accordingly, it is an object of the present inventlon to provide a glove which is permanently tackified by impregnation in order to obtain the desired permanence of the coating but ~7hich, has a non-tacky inner surface with the "feel" of leather.
It is a further objective of this invention to provide a process for producing such glove.
These and other objectives realized by the present invention whereln both sides of the glove leather are impreynated ~Z7~0~
with a solution con~aining an isobutylene-butene copolymer produced by polymerization of normal and branched chain butenes and a hydrocarbon tackifying resin, to impart the desired degree of tack to the leather. Then the inner or flesh side of the leather is coated with a solution containing, a silicone resin and a nitrocellulose binder to provide a detackl~ied surface having the desired degree of adhesion to and compatibillty with the already tackified leather.
~he nitrocellulose, by itself, will provide a barrier between the user's hand and the tackified surface, however, the feel of the dried nitrocellulose is rather hard and not leather-like. On the other hand, the silicone resin wlthout the nitrocellulose will not provide the desired degree of adhesion to the substrate. By combining these two materials, it is possible to obtain the desired non-tacky lnner surface having suitable adhesion, yet retainlng the "feel" o~ the leather.
If an excess of silicone is employed, a glove wlll feel uncomfortably slippery and if too little is used, the hard un-leather-like feel of the nitrocelluloqe will be apparent.
By employing the correct amount o~ silicone in combinatlon wlth the nltrocellulose lt becomes possible to obtain a comfortable, dry yet non-tacky sensation.
According to a feature of the invenkion there is provlded an adheeively tacki~ied leather glove havlng an lnner and an outer surface, wherein at least a portion of each of said inner and outer surfaces is adhesively tacklfied and whereln at least a portion of sald adhesively tackified lnner surface is detacki~ied, said detackifled inner surface retaining the feel of leather.

~, Accordinq to a further feature of the invention there is provided a process for producing a glove having the outer surface thereof tackified and the inner surface thereof de~ackifled ~7hich comprises the steps of:
a. immersing said leather into an organic solvent solution containing an isobutylene-butene copolymer and a hydrocarbon tackifying resin, to lmpregnate the leather with said solution, b. evaporating the solvent from said impregnated leather to thereby tackify both sides of said leather, c. detackifying at least a portion of the inner or flesh side of said leather by applying thareto an organic solvent solution containing nitrocellulose and silicone resin, d. evaporating the solvent from the leather of step c, and e. sewing the leather into a glove, wherein the other side is tackified and the inner side is detackified but yet retains the feel of leather.

3a BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 depicts a top view of the palm of a glove in accordance with the present invention.
Fi~ure 2 depicts a side view of the glove o~ Figure 1.
DETAI~ED DESCRIPTION
The proaess of this invention ls applicable to a wide variety of leathers such as calfskin, cowhide, cabretta and pigskin. The leather must be in the crust condition before treatment, that is, i~ must be unfilled and unfinished and should preferably be chrome tannsd.
With respect to the ta~kifying composition, any of a wide variety of hydrocarbon-type tackifying resins may be employed. For example, there may be mentioned aromatic hydrocarbon resins and aliphatic hydrocarbon resins.
A particularly preferred tackifylng resin ls a polymerlzed hydrocarbon resin of the Piccopale type, such as Piccolyte S 70TM available from Pennsylvania Industrlal Chemicals Corporation, Clairton, PA 15025.
In combination with the hydrocarbon resin, there is employed a synthetlc hydrocarbon polymer such as an isobutylene-butene copolymer. An example of such copolymer is eoly S 2000TM r obtalnable ~rom S and S Chemical Company, 445 Northern Boulevard, Great Neck, New York 11021 (hicJh molecular weicJht mono-ole~in content 95-100%, the balance belng isopara~ins).
The organic solvent for the tackifying solution may be ~ 21223-818 VM&P naphtha, heptane or any other non-polar, conventional organic solvent.
In preparing the tackifying solution, the isobutylene-butene copolymer and hydrocarbon resin are desirably mixed and dissolved separately with a portion of the organic solvent and then are mixed together with more of the solvent to the desired specific gravity.
While a wide variety of ratios of isobutylene-butylene copolyner to hydrocarbon resin may be employed, it has been found that about 10:1-1:10 parts of hydrcarbon resin per 1 part of the copolymer is usable. A ratio of 1 part of hydrocarbon resin to 10 parts of copolymer is preferred.
The resultant tackifying solution desirably has a specific gravity of about 0.770 at 22C.
Impregnation is effected by immersion of the leather in the tackifying solution for about 1 to 2 minutes and then hanging the leather at room temperature under slow-moving fans until the leather is dry.
In order to detackify the flesh side of the leather, a formulation was discovered which provides the desired non-tacky surface but yet also provides suitable adhesion to the substrate and the "feel" of leather.
Silicone resins do not readily adhere to leather already possessing a tackified surface. However, the co-presence of the nitrocellulose binder mixed with silicone provides satisfactory adhesion of the silicone to the already tackified fibers The ratio of silicone resin to nitrocellulose resin can vary widely, e.g. 1:30 to 1:10 but is preferably about 2 17.
The application of the detackifying composition can either be by spraying or by other conventional coating methods, followed by drying to remove the solvent.
The amount o~ detacki~ying agent applied can vary widely dependiny on the amount of detackifying effeat deslred.
A recommended amount would increase the weight o~ the leather by 5 to 7%.
The following is an example of one manner in which the invention may be practlsed:
Exam~le A. Tackifyinq procedure A sheet of cal~skin leather was permanently tackified on both sides by impregnation in a V~P naphtha solution containing 1 part by weight Piccolyte S 70 hydrocarbon tackifying resin to 10 parts by weight Poly S 2000 isobutylene-butene copolymer.
The leather was dried to provide a permanently tackified surfaae on both sides thereof.
B. DetaakifYinq procedure fox N.T.B.
The sheet of the above taakified leathar was treated on the flesh side with the ~ollowing solutionl 52% by weiyht of HydrholacTM SD-270 nitrocellulose ~o~

lacquer emulsion from Rohm and Hass Company, Philadelphia, PA
19105 and 3-6 by weight Silicone Resin LS-3399. This is a xylene solution of silicone resin from Rohm and Hass Company, Philadelphia, PA 19105.
The solvent for the above additives is thinner LS-3082 at 456 by weight. This is blend of n-propylacetate, methylethyl ketone and toluene, also from Rohm and Hass Company.
After the nitrocellulose and silicone additives were dissolved in the solvent, the solution was sprayed on the flesh side of the leather and the resultant leather was dried.
The leather possessed a tackified outer Igrain) surface and yet a smooth, fairly natural glove to hand "feel" on the inner flesh) side.
The leather was cut and sewn together to provide a glove permanently tackified on the outside and comEortably detacki-fied on the inside.
With reference to Figures l and 2, in ma~ing the tackified glove l, it is preferred that the tackified N.T.B.
leather be generally used only on the palm side of the glove, including the palm side of the fingers and at times the whole of the thumb, forefinger, and small ~inger of the glove. The tackifiad side o the leather 2 ~aces out, the ~ 21223-818 N.T.B. (non-tackified area) 3 being against the palm and fingers of the hand. Other parts of the glove (the back) can be made of completely untackified glove leather or other conventional glove materials.
Modifications of the foregoing which are within the spirit and scope of the invention will be readily apparent to those of ordinary skill in the art.

Claims (3)

1. An adhesively tackified leather glove having an inner and an outer surface, wherein at least a portion of each of said inner and outer surfaces is adhesively tackified and wherein at least a portion of said adhesively tackified inner surface is detackified, said detackified inner surface retaining the feel of leather.

2. The tackified glove according to claim 1 wherein the leather is adhesively tackified therethrough.

3. A process for producing a glove which has the outer surface thereof tackified and the inner surface thereof detackified which comprises the steps of:
a. immersing leather in a solution containing an isobutylene-butene copolymer and a hydrocarbon tackifying resin, in an organic solvent, to impregnate the leather with said solution, b. evaporating the solvent from said impregnated leather sheet to thereby tackify both sides of said leather, c. detackifying at least a portion of the inner side of said leather by applying there to an organic solvent solution containing nitrocellulose and a silicone resin, in an organic solvent, d. evaporating the solvent from the leather of step c, and e. sewing the leather into a glove, wherein the outer side is tackified and the inner side is detackified but yet retains the feel of leather.