Claims
- 1. A coating composition for paper, which composition consists of an aqueous preparation containing at least:
- (a) a polymeric binder selected from the group of starch, modified starch, styrene-butadiene copolymers or acrylic polymers in an amount of 5 to 30 percent by weight relative to the total weight of (b) and (c),
- (b) an inorganic pigment selected from the group of precipitated calcium carbonate, coating-kaolin and mixtures thereof in an amount of 75 to 98 percent by weight relative to the total weight of constituents (b) and (c), and
- (c) a water-insoluble urea-formaldehyde polycondensation product produced in aqueous solution from 1 mole of urea and 1.3 to 2 moles of formaldehyde, which product is in a highly dispersed form and has a mean particle diameter of 3 to 6 microns and a specific BET-surface area of 5 to 8 m.sup.2 /g in an amount of 25 to 2 percent by weight relative to the total weight of constituents (b) and (c).
- 2. A coating composition according to claim 1 wherein constituent (c) is a polycondensation product from 1 mole of urea and 1.3 to 1.8 moles of formaldehyde.
- 3. A coating composition according to claim 1 wherein constituent (c) is a polycondensation product from 1 mole of urea and 1.5 moles of formaldehyde.
- 4. A coating composition according to claim 1 wherein constituent (c) has a bulk density of 100 to 200 g/l.
- 5. A coating composition according to claim 1 wherein the solids content of the composition is 40 to 70 percent by weight.
- 6. A coating composition according to claim 5 having a viscosity of 1000 to 1600 cP.
- 7. A coating composition according to claim 5 having a solids content of 54 to 60 percent by weight.
- 8. A coating composition according to claim 1 wherein the percent by weight of the constituent (a) is 5 to 15 percent.
Priority Claims (1)
Number |
Date |
Country |
Kind |
16673/74 |
Dec 1974 |
CHX |
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Parent Case Info
This application is a continuation of application Ser. No. 641,587, filed Dec. 16, 1975 (now abandoned).
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3928272 |
Brancato |
Dec 1975 |
|
3953421 |
Berstein |
Apr 1976 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2100907 |
Nov 1971 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Renner, Die Makromolekulare Chemie, 149, 1-27, (1971). |
Continuations (1)
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Number |
Date |
Country |
Parent |
641587 |
Dec 1975 |
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