초록 ▼

A gypsum composition suitable for use in the manufacture of construction materials is provided. The gypsum composition includes gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A method of making a gypsum composition is also provided. The method in

A gypsum composition suitable for use in the manufacture of construction materials is provided. The gypsum composition includes gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A method of making a gypsum composition is also provided. The method includes mixing together, in any combination, gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A wallboard is provided including two sheets of board paper, and a gypsum core between the sheets of board paper.

대표청구항 ▼

A gypsum composition suitable for use in the manufacture of construction materials is provided. The gypsum composition includes gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A method of making a gypsum composition is also provided. The method in

A gypsum composition suitable for use in the manufacture of construction materials is provided. The gypsum composition includes gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A method of making a gypsum composition is also provided. The method includes mixing together, in any combination, gypsum, water, and a dispersant formulation comprising an acrylic/polyether comb-branched copolymer. A wallboard is provided including two sheets of board paper, and a gypsum core between the sheets of board paper. re separable. 8. The exercise apparatus of claim 6, wherein the elastic member extends between the foot bracket and the movable carriage. 9. The exercise apparatus of claim 6, wherein the first rail member is a rectangular tube. 10. The exercise apparatus of claim 4 further comprising an adjustable foot bar assembly adjustably mounted to the first frame section. 11. The exercise apparatus of claim 10, wherein the foot bar assembly comprises a support bracket assembly and a generally U shaped foot bar having a straight foot bar portion and a pair of parallel leg portions extending from the foot bar portion. 12. The apparatus according to claim 1 further comprising: a generally "U" shaped foot bar pivotally mounted to the rail members near the foot end of the frame, wherein the foot bar has a horizontal foot support portion having opposing end portions each joining an S shaped region merging into one of two parallel support legs, each leg being pivotally fastened to one of the rail members of the frame. 13. A reformer exercise apparatus comprising: a telescopically collapsible rectangular frame having a first frame section and a second frame section, the first frame section including two spaced apart parallel tubular first rail members extending from a first end thereof, each first rail member having an open end opposite the first end, the second frame section including two spaced apart parallel second rail members, each having one end telescopically received in the open end of one of the first rail members of the first frame section, wherein the frame is extendable between a collapsed storage position and an extended operating position; and a movable carriage mounted on the frame for supporting a user, the carriage having a first set of rollers positioned to roll only along the first frame section and a second set of rollers positioned to roll only along the second frame section to permit the user to move the carriage back and forth between the first end and a second end of the frame when the frame sections are extended in the operating position. 14. The apparatus according to claim 13 wherein the carriage is captured between the ends of the frame when the frame is in the collapsed storage position. 15. The apparatus according to claim 13 further comprising: a generally "U" shaped foot bar pivotally mounted to the rail members near the foot end of the frame, wherein the foot bar has a horizontal foot support portion having opposing end portions each joining an S shaped region merging into one of two parallel support legs, each leg being pivotally fastened to one of the rail members of the frame. 16. The apparatus according to claim 15 wherein each leg is fastened to the one of the parallel frame members by a bracket that permits the foot bar to be positioned at discrete angles with respect to the frame. 17. The apparatus according to claim 16 wherein the bracket is positioned on each of the rail members so that the foot bar may be rotated beyond the foot end of the frame. 18. The apparatus according to claim 16 wherein the bracket is slidably fastened to the rail member.