Claims
- 1. A waxless, low foaming sizing composition consisting essentially of (in parts by weight)
- (a) 100 parts polyvinyl alcohol which is at least 78 mole % hydrolyzed and has a viscosity of about 3-60 cps as a 4% aqueous solution at 20.degree. C., and
- (b) 2-6 parts ethylene oxide-propylene oxide surfactant having a surface tension less than 49 dynes/cm measured at 25.degree. C. in an 0.1% aqueous solution and a foaming number less than about 20 as a 7% aqueous polyvinyl alcohol solution containing 4 parts surfactant per 100 parts polyvinyl alcohol having a DP of about 1700 and a degree of hydrolysis of about 87-89 mole %, the surfactant being represented by one of the following formulas: ##STR3## were x and y are integers and are selected such that the oxypropylene groups constitute at least 900 molecular weight of the surfactant and the oxyethylene groups constitute 10-90 wt % of the surfactant, or the above formulas in which the ethylene oxide and propylene oxide units are reversed.
- 2. The sizing composition of claim 1 in which the polyvinyl alcohol is 85-97 mole % hydrolyzed.
- 3. The sizing composition of claim 1 in which the surfactant has a surface tension between 40 and 48 dynes/cm.
- 4. The sizing composition of claim 1 in which the surfactant has a surface tension between 43 and 47 dynes/cm.
- 5. The sizing composition of claim 3 in which the surfactant has a foaming number less than 15.
- 6. The sizing composition of claim 3 in which the surfactant has a foaming number less than 10.
- 7. An aqueous sizing composition comprising from 2 to 20 wt % of the sizing composition of claim 1 in an aqueous medium.
- 8. A waxless low foaming sizing composition consisting essentially of (in parts by weight)
- (a) 100 parts polyvinyl alcohol which is at least 85 mole % hydrolyzed and has a viscosity of about 3-60 cps as a 4% aqueous solution at 20.degree. C., and
- (b) 3-5 parts ethylene oxide-propylene oxide surfactant having a surface tension ranging from 40-48 dynes/cm measured at 25.degree. C. in a 0.1% aqueous solution and a foaming number less than about 15 as a 7% aqueous polyvinyl alcohol solution containing 4 parts surfactant per 100 parts polyvinyl alcohol having a DP of about 1700 and a degree of hydrolysis of about 87-89 mole %, the surfactant being represented by one of the following formulas: ##STR4## where x and y are integers and are selected such that the oxypropylene groups constitute at least 900 molecular weight of the surfactant and the oxyethylene groups constitute 10-90 wt % of the surfactant, or the above formulas in which the ethylene oxide and propylene oxide units are reversed.
- 9. The sizing composition of claim 8 in which the polyvinyl alcohol is 85-97 mole % hydrolyzed.
- 10. The sizing composition of claim 8 in which the polyvinyl alcohol is 85-89 mole % hydrolyzed.
- 11. An aqueous sizing composition comprising from 2 to 20 wt % of the sizing composition of claim 8 in an aqueous medium.
- 12. The sizing composition of claim 8 in which the ethylene oxide-propylene oxide surfactant is about 40 wt % ethylene oxide, about 60 wt % propylene oxide and about 3600 molecular weight and has an HLB of about 6 and a surface tension of about 41 dynes/cm.
- 13. The sizing composition of claim 8 in which the ethylene oxide-propylene oxide surfactant is about 80 wt % ethylene oxide, about 20 wt % propylene oxide and about 8550 molecular weight and has an HLB of about 12 and a surface tension of about 46 dynes/cm.
- 14. A waxless, low foaming sizing composition consisting essentially of (in parts by weight)
- (a) 100 parts polyvinyl alcohol which is 87-89 mole % hydrolyzed and has a viscosity of about 3-60 cps in a 4% aqueous solution at 20.degree. C., and
- (b) 3.5-4.5 parts ethylene oxide-propylene oxide surfactant having a surface tension ranging from 40-48 dynes/cm measured at 25.degree. C. in a 0.1% aqueous solution and a foaming number less than about 20 as a 7% aqueous polyvinyl alcohol solution containing 4 parts surfactant per 100 parts polyvinyl alcohol having a DP of about 1700 and a degree of hydrolysis of about 87-89 mole %, the surfactant being represented by one of the following formulas: ##STR5## where x and y are integers and are selected such that the oxypropylene groups constitute at least 900 molecular weight of the surfactant and the oxyethylene groups constitute 10-90 wt % of the surfactant, or the above formulas in which the ethylene oxide and propylene oxide units are reversed.
- 15. An aqueous sizing composition comprising from 2 to 20 wt % of the sizing composition of claim 14 in an aqueous medium.
Parent Case Info
This a continuation, of application Ser. No. 06/882,760 filed July, 07 1986, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (7)
Number |
Date |
Country |
0173528 |
Mar 1986 |
EPX |
21887 |
Jul 1970 |
JPX |
46-35972 |
Oct 1971 |
JPX |
35972 |
Oct 1971 |
JPX |
47-45634 |
Nov 1972 |
JPX |
48-238838 |
Mar 1973 |
JPX |
712671 |
Apr 1971 |
ZAX |
Non-Patent Literature Citations (1)
Entry |
"The Wonderful World of Pluronic Polyols"-1971 BASF Wyandotte Corp. |
Continuations (1)
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Number |
Date |
Country |
Parent |
882760 |
Jun 1986 |
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