CONTINUE:
4. A cement additive for Portland type cements comprising /2-1O% by weight polyvinylpyrrolidone having an average
molecular Weight of the order of magnitude of 40,000, and -99.5% by weight the sodium salt of naphthalene
sulfonate condensed with formaldehyde and havin an average molecular weight of the order of magnitude of 1500.
5. A Portland type cement mixture comprising water, suflicient Portland type cement to form a pumpable slurry, and
0.l-3% by weight of an additive comprising la-10% by weight polyvinylpyrrolidone having an average molecular weight
of the order of magnitude of 40,000, the balance of the additive being essentially the sodium salt of naphthalene
sulfonate condensed with formaldehyde and having an average molecular weight of at least 1500.
6. A Portland type cement mixture comprising water, sufiicient Portland type cement to form a pumpable slurry, and
O.l3% by weight of an additive comprising /2l0% by Weight polyvinylpyrrolidone having an average molecular Weight
of the order of magnitude of 40,000, and 90- 99.5% by Weight the sodium salt of naphthalene sulfonate condensed
with formaldehyde and having an average molecular weight of at least 1500.
7. A Portland type cement mixture comprising water, sufiicient Portland type cement to form a pumpable slurry, and
0.l-3% by Weight of an additive comprising /2--10% by weight polyvinylpyrrolidone having an average molecular weight
of the order of magnitude of 40,000, the balance of the additive being essentially the sodium salt of naphthalene
sulfonate condensed with formaldehyde and having an average molecular weight of the order of magnitude of 1500.
8. A Portland type cement mixture comprising water, sufficient Portland type cement to form a pumpable slurry, and
0.13% by weight of an additive comprising /210% by weight polyvinylpyrrolidone having an average molecular weight of
the order of magnitude of 40,000, and 90- 99.5% by Weight the sodium salt of naphthalene sulfonate condensed with
formaldehyde and having an average molecular Weight of the order of magnitude of 1500.
9. A Portland type cement mixture comprising water, sufficient Portland type cement to form a pumpable slurry, and
0.11% by weight of an additive comprising /2-10% by Weight polyvinylpyrrolidone having an average molecular weight
of the order of magnitude of 40,000, the balance of the additive being essentially the sodium salt of naphthalene
sulfonate condensed with formaldehyde and having an average molecular weight of at least 1500.
10. A Portland type cement mixture comprising water, suflicient Portland type cement to form a pumpable slurry, and
approximately 0.75% by weight of an additive comprising /210% by Weight polyvinylpyrrolidone having an average
molecular weight of the order of mag nitude of 40,000, the balance of the additive being essentially the sodium salt of
naphthalene sulfonate condensed With formaldehyde and having an average molecular Weight of at least 1500
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