HARDENABLE PUTTY AND PRODUCTION METHOD THEREOF

Abstract

According to one aspect of the present invention, a hardenable putty used for impression taking includes an inorganic filler at 60% by mass or greater and 85% by mass or less, wherein consistency of the hardenable putty is greater than or equal to 35, and wherein a median diameter of the inorganic filler is greater than or equal to 5 m and less than or equal to 50 m on a weight basis.

Claims

1. A hardenable putty used for impression taking, the hardenable putty comprising: an inorganic filler at 60% by mass or greater and 85% by mass or less, wherein consistency of the hardenable putty is greater than or equal to 35, and wherein a median diameter of the inorganic filler is greater than or equal to 5 m and less than or equal to 50 m on a weight basis.

2. The hardenable putty according to claim 1, further comprising: an organopolysiloxane including two or more alkenyl groups; an organohydrogenpolysiloxane including two or more constituent units represented by a general formula HSiR.sub.2O.sub.1/2 (where R represents a substituted or unsubstituted hydrocarbon group having 1 to 10 carbon atoms in the formula); a platinum-based catalyst; and a release agent.

3. A method for producing the hardenable putty according to claim 2, the method comprising: mixing a first paste that includes the organopolysiloxane and the platinum-based catalyst and that does not include the organohydrogenpolysiloxane with a second paste that includes the organopolysiloxane and the organohydrogenpolysiloxane and that does not include the platinum-based catalyst.

Description

EXAMPLES

[0041] In the following, specific examples and comparative examples will be described. The present invention is not limited to these examples. Note that parts mean parts by mass.

Example 1

[0042] A first paste was obtained by mixing 100 parts of a mixture in which a mass ratio of dimethyl polysiloxane raw rubber having a viscosity of 110.sup.6 mPa.Math.s at 25 C. to a dimethylpolysiloxane whose molecular chain both ends are capped by methylvinylsiloxy groups and having a viscosity of 110.sup.3 mPa.Math.s at 25 C. is 2 to 3; 10 parts of a methyl hydrogen polysiloxane; 40 parts of a liquid paraffin; and 300 parts of a silica powder whose median diameter is 7 m on a weight basis.

[0043] A second paste was obtained by mixing 100 parts of a mixture in which a mass ratio of dimethyl polysiloxane raw rubber having a viscosity of 110.sup.6 mPa.Math.s at 25 C. to a dimethylpolysiloxane whose molecular chain both ends are capped by methylvinylsiloxy groups and having a viscosity of 110.sup.3 mPa.Math.s at 25 C. is 2 to 3; 2 parts of a silicone oil solution containing 1,3-divinyltetramethyldisiloxane-platinum complex; 40 parts of a liquid paraffin; and 300 parts of a silica powder whose median diameter is 7 m on a weight basis.

[0044] The first paste and the second pate were kneaded 30 seconds at a mass ratio of 1 to 1 to obtain a hardenable putty. The consistency of the hardenable putty was 35.

Example 2

[0045] A hardenable putty was obtained in a manner similar to that of the example 1 except that a silica powder whose median diameter is 10 m on a weight basis was used instead of the silica powder whose median diameter is 7 m on a weight basis. The consistency of the hardenable putty was 36.

Example 3

[0046] A hardenable putty was obtained in a manner similar to that of the example 1 except that a silica powder whose median diameter is 20 m on a weight basis was used instead of the silica powder whose median diameter is 7 m on a weight basis. The consistency of the hardenable putty was 38.

Comparative Example 1

[0047] A hardenable putty was obtained in a manner similar to that of the example 1 except that a silica powder whose median diameter is 4 m on a weight basis was used instead of the silica powder whose median diameter is 7 m on a weight basis. The consistency of the hardenable putty was 32.

Comparative Example 2

[0048] A hardenable putty was obtained in a manner similar to that of the example 1 except that a silica powder whose median diameter is 60 m on a weight basis was used instead of the silica powder whose median diameter is 7 m on a weight basis.

[0049] The consistency of the hardenable putty was 41.

Comparative Example 3

[0050] A first paste was obtained by mixing 100 parts of a mixture in which a mass ratio of dimethyl polysiloxane raw rubber having a viscosity of 110.sup.6 mPa.Math.s at 25 C. to a dimethylpolysiloxane whose molecular chain both ends are capped by methylvinylsiloxy groups and having a viscosity of 110.sup.3 mPa.Math.s at 25 C. is 2 to 3; 10 parts of a methyl hydrogen polysiloxane; 40 parts of a liquid paraffin; and 180 parts of a silica powder whose median diameter is 7 m on a weight basis.

[0051] A second paste was obtained by mixing 100 parts of a mixture in which a mass ratio of dimethyl polysiloxane raw rubber having a viscosity of 110.sup.6 mPa.Math.s at 25 C. to a dimethylpolysiloxane whose molecular chain both ends are capped by methylvinylsiloxy groups and having a viscosity of 110.sup.3 mPa.Math.s at 25 C. is 2 to 3; 2 parts of a silicone oil solution containing 1,3-divinyltetramethyldisiloxane-platinum complex; 40 parts of a liquid paraffin; and 180 parts of a silica powder whose median diameter is 7 m on a weight basis.

[0052] The first paste and the second pate were kneaded 30 seconds at a mass ratio of 1 to 1 to obtain a hardenable putty. The consistency of the hardenable putty was 41.

Comparative Example 4

[0053] 100 parts of a mixture in which a mass ratio of dimethyl polysiloxane raw rubber having a viscosity of 110.sup.6 mPa.Math.s at 25 C. to a dimethylpolysiloxane whose molecular chain both ends are capped by methylvinylsiloxy groups and having a viscosity of 110.sup.3 mPa.Math.s at 25 C. is 2 to 3; 10 parts of a methyl hydrogen polysiloxane; 40 parts of a liquid paraffin; and 950 parts of a silica powder whose median diameter is 7 m on a weight basis were mixed. However, a pasty mixture could not be obtained and a first paste could not be obtained.

[0054] 100 parts of a mixture in which a mass ratio of dimethyl polysiloxane raw rubber having a viscosity of 110.sup.6 mPa.Math.s at 25 C. to a dimethylpolysiloxane whose molecular chain both ends are capped by methylvinylsiloxy groups and having a viscosity of 110.sup.3 mPa.Math.s at 25 C. is 2 to 3; 2 parts of a silicone oil solution containing 1,3-divinyltetramethyldisiloxane-platinum complex; 40 parts of a liquid paraffin; and 950 parts of a silica powder whose median diameter is 7 m on a weight basis were mixed. However, a pasty mixture could not be obtained and a second paste could not be obtained.

[Consistency]

[0055] [Consistency]

[0056] The consistency of each hardenable putty was measured in accordance with JIS T 6513:2005.

[0057] The table 1 illustrates characteristics of each hardenable putty.

TABLE-US-00001 TABLE 1 INORGANIC FILLER MEDIAN DIAMETER ON WEIGHT BASIS CONTENT [m] [% BY MASS] CONSISTENCY EXAMPLE 1 7 67 35 EXAMPLE 2 10 67 36 EXAMPLE 3 20 67 38 COMPARATIVE 4 67 32 EXAMPLE 1 COMPARATIVE 60 67 41 EXAMPLE 2 COMPARATIVE 7 55 41 EXAMPLE 3 COMPARATIVE 7 87 EXAMPLE 4

[0058] Next, the shaping property, the adhesiveness to hands, and the precision of an impression were evaluated for each hardenable putty.

[0059] [Shaping Property]

[0060] Each hardenable putty was placed on an impression material tray of upper jaw L size to evaluate the shaping property. Note that the shaping property was determined as good when the hardenable putty was able to be held in the tray, and the shaping property was determined as poor when the hardenable putty flowed outside the tray.

[0061] [Adhesiveness to Hands]

[0062] When the first paste and the second paste were kneaded and when the shaping property of each hardenable putty was evaluated, whether it adhered to hands was checked. Note that the adhesiveness was determined as good when it did not adhere to hands, and the adhesiveness was determined as poor when it adhered to hands.

[0063] [Precision of Impression]

[0064] After each hardenable putty was placed on the impression material tray of upper jaw L size, an impression of a resin upper jaw model was taken. After the hardenable putty was hardened, a hardened product of the hardenable putty was taken from the resin upper jaw model to evaluate the precision of the impression. Note that the precision was determined as good when details such as interdental portions of the impression were taken, and the precision was determined as poor when there was an unclear portion in the impression.

[0065] The table 2 illustrates evaluation results of the shaping property, the adhesiveness to hands, and the precision of an impression of each hardenable putty.

TABLE-US-00002 TABLE 2 SHAPING ADHESIVENESS PRECISION OF PROPERTY TO HANDS IMPRESSION EXAMPLE 1 GOOD GOOD GOOD EXAMPLE 2 GOOD GOOD GOOD EXAMPLE 3 GOOD GOOD GOOD COMPARATIVE GOOD GOOD POOR EXAMPLE 1 COMPARATIVE POOR GOOD GOOD EXAMPLE 2 COMPARATIVE POOR GOOD GOOD EXAMPLE 3 COMPARATIVE EXAMPLE 4

[0066] As can be seen from the table 2, the hardenable putties of the examples 1 to 3 were excellent in the shaping property, the adhesiveness to hands, and the precision of an impression.

[0067] In contrast, in the hardenable putty of the comparative example 1, because the median diameter of the inorganic filler was 4 m on the weight basis and the consistency was 32, the precision of an impression was low.

[0068] In the hardenable putty of the comparative example 2, because the median diameter of the silica powder was 60 m on the weight basis, the shaping property was low.

[0069] In the hardenable putty of the comparative example 3, because the content of the inorganic filler was 55% by mass, the shaping property was low.

[0070] In the comparative example 4, because the inorganic filler was mixed at the content of 87% by mass, a first paste and a second paste could not be produced, and a hardenable putty could not be obtained.

[0071] The present international application is based upon and claims the benefit of priority of Japanese Patent Application No. 2015-175053, filed on Sep. 4, 2015, the entire contents of 2015-175053 are hereby incorporated herein by reference.